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Corruption and the Desire to Leave Quasi-Experimental Evidence on Corruption as a Driver of Emigration Intentions

Abstract Whether and to what extent corruption drives emigration has received growing attention in the literature in recent years, yet the nature of the relationship remains unclear. To test causal claims, we rely on representative global survey data of more than 280,000 respondents across 67 countries from 2010 to 2014. We use two different measures of emigration intentions and individual, as well as country-level measures of corruption, and propose to instrument the endogenous presence of corruption in a country with the prevalence of cashless transactions in the economy to correct for potential estimation bias. We find robust support for the hypothesis that corruption increases emigration intentions across countries. The effect, however, is likely to be underestimated in conventional models that do not account for endogeneity. The results highlight the need to look beyond purely economic, social, security-related, and environmental drivers when assessing the root causes of migration.


Introduction
In the introduction to the 2004 UN Convention against Corruption, then Secretary-General Kofi Annan called corruption as "an insidious plague that has a wide range of corrosive effects on societies. It undermines democracy and the rule of law, leads to violations of human rights, distorts markets, erodes the quality of life and allows organized crime, terrorism and other threats to human security to flourish" (UNODC, 2004). This study analyzes whether emigration should be added to the list of adverse corruption effects. We investigate whether the prevalence of corruption in a country affects an individual's intentions to emigrate. In times of increasing migratory behavior, understanding the role of political drivers in countries of origin-such as corruption-concerning commonly studied drivers, such as economic differences and social networks, is crucial. Previous studies have found that corruption is associated with higher levels of emigration (e.g., Dimant et al., 2013;Lapshyna, 2014;Poprawe, 2015;Cooray and Schneider, 2016). We aim to put forward available evidence by addressing three limitations of the emerging literature on the link between corruption and emigration.
First, most studies use migration rates or flows as the dependent variables (Dimant et al., 2013;Poprawe, 2015;Cooray and Schneider, 2016). Observable migration, however, may be an imperfect measure. The flows that are officially recorded in harmonized international migration statistics do not reflect those that aspire to migration but cannot (for various) reasons and those that do migrate but may not appear in official statistics (Carling, 2002;Carling and Schewel, 2018). In this article, we instead study emigration intentions by relying on two items, the first measuring aspirations, the second measuring the expression of concrete plans to emigrate. Focusing on intentions allows us to focus on the effect of corruption at the first step of the migration process-the decision to migrate.
Second, the most existing comparative studies largely base their inference on aggregated, country-level information. Therefore, the mechanisms operating at the individual level remain unclear. Our analyses cover microlevel survey data of more than 280,000 respondents across 67 countries from 2010 to 2014 (Gallup World Poll). This data allow us not only to include two country-level composite measures of corruption (V-Dem, Global Governance Indicators) but also to introduce microlevel measures of perceptions and beliefs. Furthermore, our data allow us to control for a wide array of alternative individual push factors.
Finally, we aim to provide insights on the causal nature of the link between corruption and emigration to strengthen the key assumption underlying this growing field of research.
Given the limited data that so far has been available to researchers, most existing studies have been correlational. We propose to instrument the endogenous presence of corruption in a given country with the importance of cashless transactions in the economy. Our 2SLS model adds a more robust test of the effect of corruption on emigration aspirations to the existing literature.
Our results support claims that corruption causally drives emigration aspirations. This relationship remains robust against different operationalization, measurements, and alternative model specifications. The average estimated effect of corruption is sizable, suggesting that reducing corruption in the world's most corrupt countries could shape future migration. The findings also suggest that conventional migration models may underestimate the impact of corruption when estimation bias is not addressed.
In terms of policy implications, our findings bear the relevance for policymakers in the field of international cooperation on development and migration. Migration has become an important topic linked to international negotiations on trade and development aid. The recent introduction of positive and negative conditionalities, for instance regarding cooperation between the EU and African countries in the field of migration, represents a relevant example.
The EU engages partner countries on curbing irregular migration and facilitating readmission in return for development aid and trade liberalizations. Yet, governments at the negotiation table may themselves be contributing to out-migration by failing to curb corruption (Concord, 2018;Conte, 2018;D'Humières, 2018). Rather than trade liberalizations and aid, in the light of our findings, the fight against corruption may itself be a relevant condition for international cooperation.
and King (2017) argue that widespread corruption among government immigration officials or border guards-both in origin and destination countries-may increase the ability to migrate because the possibility to bribe officials can open otherwise closed doors. With regard to forced migration, Skrivankova et al. (2011) emphasize that corruption facilitates human trafficking.
Corruption is also likely to affect emigration aspirations in several ways. Corruption hampers economic growth, efficiency, and investment (Mauro, 1995;Méon and Sekkat, 2005), 1 and economic deprivation is known to fuel emigration aspirations. Cooray and Dzhumashev (2018) show that emigration may also be related to the negative effect of corruption on the labor market such as the reduction in labor force participation rates, increases in tax burden and the shadow economy. By increasing the level of economic uncertainty, corruption may also create incentives for the residents to leave for other countries where the level of uncertainty is lower (Dzhumashev, 2016).
Corruption also lowers returns on education, as educational attainment alone does not necessarily suffice anymore to secure a job or a contract (Dimant et al., 2013). Lower returns on education, in turn, are also known to drive emigration desires (Ariu and Squicciarini, 2013).
Finally, in corrupt countries, the allocation of resources within a state is likely to shift. Mauro (1995) argues that corrupt politicians spend more public means in sectors that allow for secretly levying large bribes. Accordingly, social policies, like education, will receive less financial support, while other sectors, like defense, will thrive. Taken together, these mediating factors, such as poor economic performance, lower returns to education, a lack of public investment, and impaired institutions, are widely acknowledged to stimulate emigration (Lee, 1966;Rowlands, 1999;Black et al., 2011;Carling and Talleraas, 2016;Arango, 2017). The prevalence of emigration aspirations is, therefore, likely to increase in corrupt societies due to the detrimental effects corruption has on general economic and societal circumstances.
Corruption may, however, also stimulate emigration aspirations through another channel. Apart from a marginal fraction of a society that benefits from a corrupt and dysfunctional system, the majority experiences corruption as obstructive and costly. This idea is supported by case studies that suggest corruption is often perceived to hinder personal and professional freedom and development (Mullan, 2006;Malaj and de Rubertis, 2017;Kalachev, 2018;Traikova et al., 2018) and, therefore, causes frustration with what is seen to be an unfair system ( Clausen et al., 2011). This erodes an individual's beliefs in meritocracy and with that the belief in social and/or economic mobility in the future. In its essence, corruption depletes individual optimism and the belief that merit is adequately rewarded and, as a consequence, spurs an individual's desire for change, potentially through emigration.
In sum, corruption may positively affect both emigration aspirations and ability through several different mechanisms. Results of existing empirical studies support this assumption (Dimant et al., 2013;Lapshyna, 2014;Poprawe, 2015;Cooray and Schneider, 2016). Building on this literature, we aim to address some of the pending limitations in this emerging field.
Previous studies have predominantly analyzed how corruption affects international migration flows (see e.g., Dimant et al., 2013;Poprawe, 2015;Cooray and Schneider, 2016 2 ). Aggregate flows, however, capture only those people who can realize their desire to emigrate. By definition, the number of people who wish to leave always exceeds those who possess the necessary resources or ability to do so (Tjaden et al., 2018). Analyzing actual migration flows, thus, likely underestimates the influence of corruption on the desire to emigrate across the whole population (Docquier et al., 2014). Analyzing aspirations separately allows for assessing how contextual factors incite the willingness to leave, independent of the ability to act upon that desire.
Analyzing aspirations also captures those individuals who may only be able to realize their aspiration using irregular paths of entry. This is even more relevant because a sizable share of (regional) migration is irregular, which is not accounted for in official migration statistics.
In addition to the conceptual issues of disentangling aspirations and ability, other issues need to be addressed. Studies on the corruption-migration relationship covering multiple countries base their inference on aggregated country-level information (e.g., Lapshyna, 2014;Cooray and Schneider, 2016). Therefore, the mechanisms operating at the individual level remain a black box. Those studies that take individual experiences and perceptions into account are often based on single-country or small-N case studies (e.g., Mullan, 2006;Malaj and de Rubertis, 2017;Traikova et al., 2018;Kalachev, 2018).
Finally, most research so far has been limited to correlational analyses (e.g., Carling et al., 2015;Poprawe, 2015). Even when additional, intervening drivers are taken into account, the endogenous presence of corruption in a country is likely to bias estimates. Yet, clarity about the causal nature of the corruption-emigration nexus is crucial to allow for further developments in this line of research.
The following analysis aims to contribute to the study of the migration-corruption nexus by strengthening assumed, but largely untested, causal claims and by considering both individual and country-level mechanisms. Our findings bear the relevance for policymakers in the field of international relations where migration is becoming an increasingly important piece in government negotiations on trade and development aid.

Data and identification
We use representative, repeated cross-sectional data covering 67 countries 3 from 2010 to 2014 provided by the Gallup World Poll (GWP, 2015). We test the effect of corruption on emigration intentions by combining micro-level information for more than 280,000 individuals with macro-level country characteristics and two instruments to account for endogenous corruption prevalence.
We use the term intention as an umbrella term. Individual-level emigration intentions Y are in fact captured using two different survey items. The first is a measure of aspiration 4 : "Ideally, if you had the opportunity, would you like to move permanently to another country, or would you prefer to continue living in this country?" The second measure refers to a concrete plan and time frame: "Are you planning to move permanently to another country in the next 12 months, or not?" We argue that the second measure captures not only aspiration but, to an extent, also ability based on the assumption that those individuals who perceive themselves to be able to realize a move are more likely to state having a concrete plan in a specific time frame.
Neither measure captures whether or not the aspiration to leave materializes. As argued earlier, independent of a person leaving, we test whether corruption affects the intention to do so in the first place.
To measure corruption, we implement a two-tiered approach. In most existing studies, corruption is measured by external assessments (e.g., Dimant et al., 2013) or hybrid indices that combine expert opinions with survey data to estimate a country's level of corruption (e.g., Ahmad, 2001;Ahmad and Arjumad, 2016). We follow this approach and include measures of corruption at the country-level. We use Coppedge et al.'s (2018) V-Dem 8 index for regime corruption, which is constructed from V-Dem's measures for executive embezzlement, executive bribes, legislative corruption, and judicial corruption. This continuous index ranges from 0 to 1, with higher values indicating higher levels of regime corruption. As a check for measurement robustness, we estimated all models with the inverse of the World Bank's World Governance Indicators' assessment of corruption control in a given year (World Bank, 2018a rescaled from 0 to 1; e.g., Svensson, 2005) and Transparency Internationals Corruption Perception Index (CPI) (Transparency International, 2018). All estimations are robust with regard to the country-level measure used. In the text, we report the results using the V-Dem indicator. The results for WGI and CPI are found in Appendices C and D.
Alongside country-level measures of corruption, we add individual perception measures.
Although country-level measures undeniably provide highly valuable and comparative information on the prevalence of corruption at the country level, within the same country, there are differences between individuals with regard to the degree they encounter or perceive corruption (e.g., Treisman, 2007). 5 Importantly, we argue that both the individual perception of corruption and country-level prevalence affect the desire to leave. The individual-level perception variables function as a proxy for direct exposure to corruption (having to bribe someone or witness incidents). They are measured using the following binary items: "Is corruption widespread throughout the government in this country, or not?" and "Is corruption widespread within businesses located in this country, or not?" (1 if either government or business is perceived to be corrupt). To our knowledge, GWP data is the only source for individual perceptions with comprehensive country coverage (cf. Merkle et al., 2017). 6 We always include the country-level corruption measures alongside the individual-level measures, to ensure that corruption perception is compared across individuals that are situated in similar contexts.
To further approximate the effect of corruption on emigration intentions at the individual level, we introduce a dummy for agreement with the statement that hard work brings success: "Can people get ahead in this country by working hard or not?" The logic behind including this 5 Empirically, the V-Dem indicator for corruption is moderately positively correlated with the 6-year average share of respondents who believe their country to be corrupt (correlation coefficient = 0.538). 6 The GWP includes a number of other measures of corruption, among them "Was there at least one instance in the last 12 months when you had to give a bribe or present, or not?" which is a more direct measure of exposure to corruption. However, all of the other corruption measures were unfortunately only asked for a limited number of countries and years, thus now allowing for larger scale comparative analyses. as a proxy for corruption experience is that exposure to corruption decreases returns on education, hinders promotions at the workplace, and imposes constraints on individual efforts (e.g. Dimant et al., 2013). We expect that people who are affected by corrupt practices in some way or the other are less likely to agree with the statement that hard work pays off. At the country level, the share of people disagreeing with 'hard work pays off' is positively correlated with the country's V-Dem level of corruption (see Figure A1 in Appendix).
Subsequently, we add several individual-level controls X ' j , including standard socioeconomic characteristics, as specified in previous studies (e.g., Castles et al., 2014;Poprawe, 2015): gender, age, educational attainment (three-level), whether the person is single (unmarried) and if they have minor children. The corresponding summary statistics can be found in Table A1 in Appendix. We further control for the respondent's urban or rural area of residence and proxy economic wellbeing with household income (population quintiles). As a key potential pull factor of migration, GWP allows for the consideration of individual connections abroad by accounting for having relatives or "someone who I can rely on" living in another country. We also control for a country-level index measuring political stability and the absence of violence and terrorism (World Bank, 2018a; see also Dimant et al., 2013), 7 and whether the country was involved in an armed conflict with more than 25 battle-related deaths in a given year based on the UCDP/PRIO (2018) armed conflict dataset (Gleditsch et al., 2002). As a more general measure of stability, institutional quality and personal freedom, we further introduce the Cato institute's Human Freedom Index (Vásquez and Porčnik, 2019). As stressed for instance by Merkle et al. (2017), controlling for regime aspects is important because high levels of corruption weaken institutions, which in turn is often associated with unstable and undemocratic regimes. Furthermore, we include controls for the log GDP per capita in 2010 USD, income inequality by the country's GINI index, and financial development to account for economic development. A full list of sampled countries as well as their respondents' mean levels of emigration desires and plans is shown in Table A2 in Appendix.
We do not include destination country characteristics in our model, although destination characteristics and a proxy for the cost of migration play an important role in gravity models estimating actual migration flows (e.g., Grogger and Hanson, 2011;Ortega and Peri, 2013). As we analyze emigration intentions, however, our sample includes individuals who do not state any desire to leave and thus, also do not have a preferred destination. Furthermore, among those expressing a desire to leave, not everybody has a clear notion of their preferred destination. Finally, assessments of preferred destinations would be biased by subjective beliefs and incomplete information (for instance regarding employment regulation at the destination, or opportunities in general). Therefore, we define our emigration model as where the individual probability of expressing emigration intentions Y j in country i at time t is a function of a set of individual socioeconomic characteristics X ' j , the country's level of corruption C it at time t, the individual belief regarding the level of corruption in the country B jit at time t, additional country characteristics u it , and an error term. However, ordinary 7 WGI-polstab measures the perception of the likelihood of political instability and/or politically motivated violence, including terrorism. least squares will produce misleading results if corruption is correlated with the error term.
This might be the case for many reasons: Apart from the fundamental concern of omitting variables that simultaneously affect emigration aspirations and corruption, causality may run from emigration aspirations to corruption and not vice versa. This concern would, in fact, be more pronounced if we were to analyze actual migration flows, for instance. Abdih et al. (2012) find that migrant remittances increase corruption in their origin countries. There is also some evidence that causality could run from emigration intentions to corruption as a rent-seeking practice, as highlighted by Mariani (2007).
To approach these endogeneity concerns, we follow an instrumental variable approach as has been widely adopted in migration research (e.g., Altonji and Card, 1991; for an overview see also Jaeger et al., 2018). Cooray and Schneider (2016) have recently estimated the effect of corruption on aggregated migration flows into 20 OECD countries with the geographical distance to the equator of the country of origin as an instrument. We argue that the effect of corruption on emigration, when corruption is instrumented by latitude, is biased by other channels through which latitude may be correlated with the error term. 8 Hence, we propose the importance of cashless payment systems in the economy as an alternative measure. In addition, we instrument corruption with the level of corruption in 1950 (initial corruption), as has been done, for instance, by Gupta et al. (2002) and Cooray and Schneider (2016).
The identifying assumption is that a nation's reliance on cashless payment negatively affects (money-related) corruption because paper-trails render bribery more difficult (e.g. Tanzi, 1998). Vice versa, an economy that relies more heavily on cash transfers offers more opportunities for (financial) corruption. Payments can be hidden, and documentation is more difficult to track compared to electronic payments. Ayoola (2014) demonstrates this relationship using the example of Nigeria where a cashless policy was recently initiated to curb corruption (see also Mieseigha and Ogbodo, 2013). Similarly, the government of India banned the vast majority of the nation's banknotes with the stated goals of fighting corruption (Shendge et al. 2017;Pal et al., 2018).
On the other hand, whether cash or electronic payments prevail in a country of origin is arguably not a decisive factor for migration aspirations. However, it is conceivable that there may be an indirect effect of the instrument on the dependent variable running through economic performance (e.g., Altunbas and Thornton, 2011; Gupta et al., 2009;Huang 2010). We thus include controls on financial and economic development. The adoption of cheque, card, and electronic money in several European Union countries between 2000 and 2012 has led to (moderate) economic growth in the long run (Tee and Ong, 2016). Positive short-run effects have also been observed in the wake of a more recent major policy shift towards a cashless economy in Nigeria (Mieseigha and Ogbodo, 2013). As was argued earlier, economic development is an important driver of migration. Hence, in our 2SLS model, we account for the potentially confounding channel of cashless payments on migration through economic performance by controlling for GDP per capita (log). Furthermore, cashless payments could also be positively related to financial development, which has been shown to facilitate migration (e.g., Rozelle et 8 Geographical distance measures have experienced extensive use as explanation for various outcomes. For instance, La Porta et al. (1999) show that the quality of government increases with increasing distance from the equator. Sachs (2001), in turn, links economic development to climatic zones and Gupta et al. (2002) use latitude and level of democracy to instrument the effect of corruption on income inequality and poverty. Arguably, corruption is related to all of the above, that is, government performance, economic development, income inequality, and poverty.
al., 1999). We thus include the International Monetary Fund's index of financial development in our estimations (IMF, 2018).
We utilize information on the importance of cashless payment systems from the World Bank's Global Payment Systems Survey (GPSS) (World Bank, 2018b). To minimize biased estimates resulting from measurement errors, we introduce two different instruments that follow the same logic but capture different dimensions of the cashless economy: first, we introduce the number of debit/credit/e-money accounts per capita (IV-accounts) as a baseline. The number of accounts each resident holds on average can be regarded as a proxy of how widespread cashless transfers are in a country. Hence, the IV-accounts can be regarded as the underlying capability of a population to use electronic payment systems. As an alternative, we measure the value of cashless payments relative to the Gross Domestic Product in a given year (IV-value).
This share shall denote the importance of the cashless sector in a given country reflected in monetary terms.
Accordingly, we argue that payment modalities together with initial corruption address the potential endogeneity/measurement error in the country's corruption level by instrument- where Ĉ it indicates the predicted values from the first stage regression The proposed instruments pass all established tests for validity and strength, as we will demonstrate in section 4 below. 9

Empirical results
A first look at the bivariate relationship between corruption levels and levels of emigration aspirations at the country level supports previous findings. Figure 1 shows the descriptive relationship between a country's level of corruption (V-DEM) and the share of residents with emigration aspirations (both measured at the 5-year country average 2010-2014). The overall relationship is positive, with countries ranking lowest on the corruption scale, such as Australia or Sweden, having emigration aspiration rates below 20% of the representative sample, while in more corrupt countries-despite larger variation-up to 50% of the sample shows a desire to leave the country.
In Table 1, we present the estimated corruption coefficients for emigration aspirations.
We follow a stepwise logic of assessing the robustness of the corruption effect. 10  Higher perception of corruption increases the desire to emigrate, whereas the belief that hard work pays off decreases that desire.
Our main 2SLS specifications are presented in Models 4 and 5, where we instrument corruption in a current year with IV accounts (Model 4) and IV value/GDP (Model 5), together with initial corruption. The full regression results can be found in Table B1 in Appendix. The results of the IV regression show an effect of corruption on emigration aspirations of approximately the size of the OLS estimates when using the value of cashless payments as an instrument. The effect is twice as high than the OLS estimates, however, when instrumenting endogenous corruption with the number of cashless accounts (Model 4). This seems to support the endogeneity assumption: (adjusted) OLS underestimates the effect of corruption on emigration because of potentially unmeasured confounders (e.g., Hogan and Lancaster, 2004 The country-level measure of corruption is a decisive push-factor for emigration aspirations across all specifications. All other covariates have effects in the expected direction (see Table B1 in Appendix). Adding the perception proxy to the model, that is, whether the respondent thinks that the government and/or businesses are corrupt, ensures that the coefficient of .4 .5 Emigration aspirations (population share) the country-level measure is not distorted by variation in individual exposure to corruption.
Moreover, keeping the overall corruption level in a country at the mean, perceiving the government to be corrupt has a significant effect in both 2SLS models. Similarly, individual disagreement with the statement that hard work is rewarded-a fact that is more likely to be given in more corrupt countries-consistently increases emigration intentions. Hence, the results indicate that emigration desire is driven by both, country-level prevalence and individual beliefs about or experiences of corruption.
The estimated 2SLS coefficient for cashless accounts amounts to 0.370 and 0.167 for the value of cashless payments, respectively, for a change in corruption level from 0 to 1.
To illustrate the effect sizes, let us assume that normalized values from 0 to 1 describe the percentage of corruption in a country: If the corruption level in (a counterfactual) Nigeria would decrease by 50 percentage points (from 90 to 40%, approximately the corruption level of South Africa), the predicted share of individuals with emigration desires would fall by up to one quarter, from 46% to a share between 27 and 37% of the adult population. In contrast, should Germany-ceteris paribus-experience a drastic deterioration in its corruption level from 2% to South Africa's current level (37%), we would expect the share of the adult population with a desire to emigrate to jump from 16 to level between 22 and 29%.
Moving from aspirations to a model that also incorporates the ability to some extent, we report the estimated corruption coefficients for plans to emigrate in the next 12 months in Table 2 (see Appendix B2 for full regression table). Estimating the effect on corruption on concrete emigration intentions serves as a robustness check, but also allows us to draw some conclusions with regard to the aspiration-ability nexus. Table 2 shows that the size of the coefficient decreases for all the corruption measures. Corruption thus seems to have a stronger influence on aspiration than on concrete plans. The explained variance decreases substantially, too. This Last, we perform several sub-sample analyses presented in Table E1 in Appendix. The effect runs in the same direction across all sub-samples, that is, higher endogenous corruption is associated with higher emigration desire/intentions when instrumented with cashless payment systems. However, based on effect sizes and their robustness, it seems that the corruptionemigration relationship is mainly driven by poorer and economically unequal countries (Models 3,4 and 7,8). This could be driven by the fact that corruption and therewith its detrimental impact is more prevalent among poorer and unequal countries. Interestingly, the effect is stronger across more politically stable countries (Models 9,10), which one could explain with generally high emigration aspirations across countries stricken by conflict and instability. In other words, the absence of economic opportunities and the perception of unfair returns may by superimposed by more substantial threats to live and belongings as an emigration driver.
Overall, our results support claims of a causal relationship between corruption and emigration intentions. We demonstrate that the corruption effect stands the test of quasi-experimental approaches using a set of innovative instruments with the number of accounts capable of cashless payments and the value of cashless payments relative to the country's GDP. We argue that both instruments are meaningful and report a series of successful testing of their power and validity. We can show that models without correction for endogeneity are likely to underestimate the effect. In sum, the prevalence of corruption in a country induces emigration intentions, which-on average-are associated with increased migration flows (e.g., Tjaden et al., 2018).

Conclusions
The necessity to account for politics and institutions in origin countries when trying to explain emigration has been pointed out by many researchers ( Cooray and Schneider, 2016) and generate confidence that the individual probability of wishing and planning to emigrate is causally related to the prevalence of corruption in the country.
The results also show that the corruption effect is likely to be underestimated when endogeneity is not addressed appropriately.
Providing reliable evidence on the link between corruption and emigration is a crucial step forward for the academic study of migration. The results provide researchers with more confidence that corruption effects are not statistical artifacts and deserve further exploration.
Corruption indices may also be a useful addition to general migration models aiming at predicting flows or investigating other migration drivers.
Understanding the relationship between corruption and emigration is also important for policymakers in countries of origin and countries of destination alike. From the destination countries' perspective, EU policy-makers, for instance, have stressed the need to address "root causes" of irregular migration in light of increased immigration in recent decades (European Commission, 2018). In addition, there is growing attention to supporting improvements in governance in origin countries through conditional development assistance.
However, our analysis does not come without limitations. First and foremost, our sample does not cover all countries. In providing empirical evidence for 67 countries across the globe, we reach beyond most existing research; yet, the data still represents approximately a 37% sample of the global population. Secondly, it has to be taken into account that our dependent variables-emigration desires and plans-warrant attention per se, as they are an approximation of actual migration, although we argue that both reflect a valid measure to test corruption effects. Additionally, recent research has shown that the correlation between intentions and flows is very strong (e.g., Tjaden et al., 2018). Thirdly, our ability to capture the direct effect of corruption is limited, as perceptions are likely to be correlated, but not necessarily identical with actual experiences. Under certain circumstances, such perception measures may even be preferable for estimating migration intentions, but inferences about the direct effect of corruption have to be drawn with care. Additionally, the definition of corruption and its measure is always imprecise to a certain extent. As stressed by Cheng and Zaum (2008) for the policy sphere, it is plausible that the GWP individual-level measure of corruption perception depicts a "catch-all" term, including aspects beyond a close definition, such as mismanagement or dysfunctional rule of law. This is also partly true for macro-level measures such as the WGI which-among other sources-rely on survey information when assessing a country's level of corruption. However, by accounting for both measures, subjective corruption perception and V-DEM as an external proxy, we seek to address criticism regarding the shortcomings of using either measures of perceived or of actual (experienced) corruption (e.g., Treisman, 2007; Donchev and Ujhelyi, 2014;Jahedi and Méndez, 2014).
Despite these limitations, our study contributes to the field by strengthening its main underlying assumption, that corruption indeed triggers emigration intentions. We improve the robustness of OLS estimates on the effect of corruption on emigration aspirations by means of an improved 2SLS identification to draw causal inferences. Moreover, by systematically combining individual-with country-level assessments of corruption and by estimating the effect on two different layers of emigration intentions (aspirations vs. plans), we are able to further investigate the mechanism at play. Overall, corruption deserves more scholarly and policy attention as an important push factor of migration.