system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Economics is a failed science

**Science** is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.

**Economics** is the social science that studies how people interact with value; in particular, the production, distribution, and consumption of goods and services.

I contend that whilst Keynesian and the Chicago school had some enlightening value during the 20th century, recent macroeconomics have 

1. had no predictive value in this century
2. failed to provide any useful post-mortem analyses of financial crises
3. created no concrete tools to ensure economic stability

and thus have failed as a science. 

The strongest support for this position is economists' continued conviction that quantitative easing, low interest rates and helicopter money will stimulate growth and provide an ideal inflation of \~2%. This has been consistently proven false for nigh-on two decades and yet they continue to prescribe the same medecine. Einstein once said that insanity is doing the same thing over and over and expecting a different result; QED.

I believe that the explanation is that 20th-century economics worked fairly well when limited to a single country or culture but are no longer applicable in a globalised world. The free-market has severely constrained governments' ability to control the flow of goods and exchange rates, resulting in a system that borders on the chaotic. Perhaps the only economist who has tried to address this is Wallerstein, unfortunately his World-Systems theory asks many questions but provides few answers.

Thus, current macroecomics and the economists that preach them have no further value.
gpt
It’s seems to me you are only saying that the current theory of economics which you present is failing, rather than the actual science of it. Just because astronomers got the sun and planets revolve around the earth theory wrong doesn’t mean that the science of astronomy is fundamentally wrong. 
 
Every single field of science is a work in progress, and by definition is a trial and error (experimental) process. Same thing applies to the science of economics.