Mainstream economists appear to me not to appreciate the two most important arguments that we have. One is the socialist calculation argument. My sense is that mainstream economists either do not believe that the socialist calculation problem is real, or they believe that it only applies to socialist dictatorships. In fact, any government program to spend, tax, or regulate will encounter the socialist calculation problem. That is, government planners face a fundamental information problem themselves. Knowledge is dispersed. What planners do not know is important, and indeed it can be more important than what they claim to know about market failure.
The second argument is the public choice argument. This is often over-simplified as “government officials act based on self-interest.” The deeper issue, which Boettke mentions in his post, is that markets and government should be looked at in parallel as institutions. The market process has certain strengths and weaknesses. Government has other strengths and weaknesses. The mainstream approach simply assumes away all weaknesses of the political process. Once an economist identifies a market failure and a policy to treat it, the next step if to play fantasy despot and recommend the policy.
All emphasis mine. Via Pete Boettke on Ideology and Economics | askblog.