Economic history doesn't support this claim. The end of the 18th century had much less regulation and much wilder and more frequent booms and busts. Booms and busts aren't usually caused by good or bad investments, they are caused by shifts in aggregate demand. Shifts in aggregate demand can be caused by good and bad investments, of course. Unemployment is a waste of national resources, so it behooves the government to stimulate demand in order to stimulate production when there are employable people out of work.The effect is to incentivise investments perceived to be poor. The urge to reduce risk and maximize profit minimizes the boom/bust while state regulation accelerates it.
So my answer is capitalism properly tempered by Keynesian countercyclical policy. Republican politicians like to call that socialism, which is dumb because it doesn't entail managing any industry. Of course, hardly anyone is a Keynesian during the boom (which would mean cutting spending or raising taxes), which is just as essential as being Keynesian during the bust (which means supporting stimulus packages consisting of spending or tax cuts.) Oddly, republicans seem to have it in their head to do the opposite: cut spending and "get the fiscal house in order" when our tax income is at its smallest and the economy its weakest. And then pass any surpluses back to taxpayers in the form of tax cuts... and we wonder why we have such a large national debt.