The History of Economics and the Development of Free-market Ideology
It’s a bit long but if you read the two sections:
Classical political economy as a program of fiscal and financial reform
Post-classical economics as a reassertion of special rentier interests – by ignoring them
you will get a portrayal of the development of neo-classical economics (the type taught in modern economics departments that focuses on the justification of prices set in the free market) as a response to classical economics’ criticism of rent-seeking behavior (payments for non-productive economic activity).
The rest of the article is mainly historical context and arguments related to the current direction of “Left” political parties.