This is basically how real fiat currencies work to an extent too - central banks attempt to keep things "stable" (for whatever definition of stable people focus on) through controlling the supply of new money and influencing the interest rates on people holding money. If things slow down you can print more money and decrease interest rates to give people an incentive to get rid of their money (since it's losing value) - ie spend it. when things are running hot, you can throttle the money supply and increase interest rates to reign things in a bit
(there's a lot more going on in real fiat currency economies of course)
