Interest rate management is their tool of choice because it can be effective and because central banks regulate the supply of money, which directly effects the cost to borrow it. Lower interest rates incentivize borrowers to take on debt and consume while dis-incentivizing savings.

Regrettably, a growing consequence of favoring lower than normal interest rates for prolonged periods is that consumers, companies, and nations grow increasingly indebted as a percentage of their respective income. In many cases, consumption is pulled from the future to the present day. Accordingly, less consumption is needed in the future and a larger portion of income and wealth must be devoted to servicing the accumulated debt as opposed to productive ventures which would otherwise generate income to help pay off the debt.