Just going to leave this here. Its a real helpful read for any kind of economics debate.
Real markets work on markup-based pricing and cash flow from profits. See Steve Keen's work[1]. In a world where the banking system can introduce nearly infinite leverage into any financial transaction (see student loans) what's the price of anything?
[1] - http://www.amazon.com/Debunking-Economics-Revised-Expanded-D...
In an 'efficient' market all future risk is included in the analysis of current value meaning that if it was an 'efficient' market this would actually not be a problem. However it is just one of many* ways that markets are not in reality 'efficient' in the economics sense as the assumptions required to prove them just do not match up to the real world.
* http://www.amazon.com/Debunking-Economics-Revised-Expanded-D...
He is very difficult to categorize: he is a liberal Australian academic who is an admirer of both Keynes and Hayek, and has built upon and synthesized both of their work. He does a lot of computer simulations of economies using real-world behaviors (e.g. mark-up pricing) and has generated results and opinions that are guaranteed to annoy pretty much everyone.
He blogs at Forbes (which is funny, given his politics):
http://www.forbes.com/sites/stevekeen/
And has a great book out that takes on classical economics:
http://www.amazon.com/Debunking-Economics-Revised-Expanded-D...