Fiscal and monetary policy?

Fiscal policy can be used to change the pace of economic growth through taxes. If capital were taxed more then there will be less of it because it will be more expensive to aculate it. The other side to that is fiscal policy can be used to take tax dollars and us it in a way to prop up economic demand. Monetary policy is more narrow. The only purpose of monetary policy is to control the flow of money so that isn't inflationary/deflationary.