Rentier capitalism has become predominant in capitalistic economies since the 1980s. Lenin viewed rentier states (rentnerstaat), or usurer states, as a form of imperialism. In the speculator group Class I residues predominate, in the rentier group, Class II residues. A rentier state's economy is predominated by the dependency on external rents. Rentier state theory foregrounds important puzzles in contemporary politics. Oman's socio-economic structure is described as being hyper-centralized rentier welfare state. With the revenues from its hydrocarbon industries Qatar has established a rentier economy. In a rentier state the economy relies on "external rents". Jordan operates a rentier economy based largely on foreign aid, investment, and remittances. His parents were Paul Vian, a young rentier, and Yvonne Ravenez, amateur pianist and harpist. It also expanded the role of the Housing Trust, potentially undercutting the rentier class. The building was erected on behalf of Gustav Reschke, a rentier. It is precisely these characteristics that bring forth a specific "rentier mentality". Beblawi identifies several other characteristics particularly associated with rentier oil states. The building was erected on behalf of the rentier Gustav Reschke.