I happen to believe prosperity can be willed into existence in some cases, and it doesn't require war. If you have significant unemployment, cooking up a plan to put those people to work in >0 productivity endeavors will result in increased prosperity, even if it isn't nearly as efficient (productive) as the free market would produce. The degree of the effectiveness is a function of how inefficient the natural economy is at the time (and monetary & cultural factors, etc), so it's certainly not a simple formula.