Like everything to do with money once someone figures how to manipulate the system, the system stops working and ends up being something it was never intended to be.
The beauty of bitcoin is that once someone starts to manipulate it and it stops working right, people can simply abandon it for a different altcoin of some kind.
It's that simple...conventional economic theory is so yesterday.
Economics works regardless of the monetary system because it is how human beings live their lives, whether they are conscious of it or not. Every single decision, no matter how small, no matter how many each day, is made using cost/benefit analysis. You state that "it doesn't work", might I ask why you believe such a thing?
It's that simple...cost/benefit analysis is so every day.