Economists: Fools?

Anyone ever heard this one:

‘One thing that economists do know is that the study of economics is divided into two fields, “microeconomics” and “macroeconomics”. Micro is the study of individual behaviour, and macro is the study of how economies behave as a whole. That is, microeconomics concerns things that economists are specifically wrong about, while macroeconomics concerns things that economists are wrong about generally.

P. J. O’Rourke
Eat The Rich

Read this in a book by Paul Omerod entitled Why Most Things Fail. Fitting title, eh?