23 Things They Don't Tell You About Capitalism is a good detox for neoliberal ideology. Old school Keynesian rather than Marxist, but Chang's a great writer and unambiguously leans left. Reads fast.
from the viewpoint of the left
23 things they don't tell you about capitalism by professor ha-joon chang is probably a good place to start.
i'd also suggest "killing the host" and " j is for junk economics" by prof. michael hudson.
the portion of "the occupy handbook" by emmanuel saez provides a good breakdown.
"the great divide: unequal societies and what we can do about them" by joe stiglitz.
i was going to suggest brad delong but a lot of his work is quite technical.
if you'd like to venture into the intersection between econ and sociology, i very strongly recommend "the spirit level: why greater equality makes societies stronger" by kate pickett and richard wilkinson.
from the viewpoint of the right:
if you want to go straight to the fountain i'd suggest principles of economics/microeconomics/macroeconomics by greg mankiw.
daron acemoglu presents a compelling argument for "free trade" and the law of comparative advantage in "why nations fail: the origins of power, prosperity and poverty” (even though imho, at the macro level lca falls apart).
earlier works by larry summers might give some insight.
don't forget to read some malthus.
* Twenty-Three Things They Don't Tell You about Capitalism 
* Bad Samaritans: The Myth of Free Trade and the Secret History of Capitalism 
 https://www.amazon.com/Things-They-Dont-About-Capitalism/dp/... https://www.amazon.com/Bad-Samaritans-Secret-History-Capital...