"Buy an economy" is a meaningless term. They can either buy products and services or invest. And this is dangerous why? If they decide to start spending their m

"Buy an economy" is a meaningless term. They can either buy products and services or invest. And this is dangerous why? If they decide to start spending their money, this would indeed mean temporary inflation as the money supply circulating would increase. But this also means that they themselves, the rich ones, will lose a lot of the value of their remaining money. Also, they wouldn't be able to spend it all at once, so with each new chunk of investment the value of their money will be less and less and less. The truth, as it turns out, that in a deflationary system rich are only rich as long as they don't spend too much and invest wisely. Thus the incentive is there to continue hoarding, even though this incentive is quite different from the incentive of the poor: for the poor in a deflationary system the incentive to hoard is making money. For rich the incentive is not losing them.