Which is the best economic system? The one we have in America, and is reaching all the parts of the world.
Why is it best? Because it is two-part. The first part is made up of investors. The second part is made up of people who simply use the money for trade, but do little investing.
If the money system collapses, the investors will be done for. Average non-investors will keep on using the greenbacks for simple trade until they wear out. By that time, other currency, or Bitcoin, will become prevalent enough to take the place of the worn-out cash dollar bills.
Of course, by then the investors will have thought of ways to mess with the money again, for investing purposes.
As it is, the two systems, investors and users, are separate. The collapse of one won't have much impact on the operation of the other.