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There is controversy among economists over just what it is that economists should do. The controversy is centered on the question whether what is called "neoclassical" or "mainstream" economics provides the appropriate template for performing economic analysis. Neoclassical economics is based on the principle that economic behavior is guided by "rational choice," i.e., choice based on reason rather than sentiment. Challenges to this principle come from several fields of study: behavioral economics, neuroeconomics, Austrian economics, Keynesian economics, and others. A common thread running through these fields is that the rational choice assumption is unrealistic and therefore not useful for analyzing economic policy choices. It is important, however, to distinguish between economic policy choices, which are frequently irrational, and how individuals are observed to react to these choices. Examples of irrational policy choices are minimum wage laws, buy-American rules, and corporate tax increases. The job of the economist is to play a role akin to that of preachers, in exposing such choices for their irrationality.