>>17
I believe there's a couple issues with that.
For a), that will require an overhaul of corporate law, a significant increase in government oversight, and a far more pervasive and restrictive set of laws. In other words, to mitigate the sole drive for profit, you'll end up with a bunch of pseudo- (or even complete) crown corporations, a big-brother government, and a rather restricted economy. If you don't do all of the above, the PIs just go off an do whatever they want.
Besides, shareholders aren't a good moderator to begin with. Shareholders invest with the hope of returns, and great potential gains usually come with the concomitant risk.
For b), while I agree with what you say, there is a caveat: you'll have to completely redefine "profit", because there are some industries that are simply unprofitable from a monetary perspective, yet need to be done anyway. For others, like healthcare and possibly essential services and utilities, the markets do not fulfill the necessary prerequisites for an effective profit-driven laissez-faire system.