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Suppose that widespread use of wireless technology to "pay by touch" of a cell phone or credit card reduces the demand for money. According to...

By liquidity preference theory (which is pretty solid, as economic theories go), reduced demand for money would come increased demand for savings, which would drive interest rates down. (It's not strictly true in every respect, but it can be useful to think of interest rates as like "the price of money"; if demand for money goes down, the "price" goes down---interest rates go down.)

If the Federal Reserve wants to maintain stable interest rates in this scenario, they should sell bonds, lowering the price of bonds, which raises the yield of bonds and thus raises interest rates. You can also look at it another way, which is that they take in money when they sell the bonds, reducing the money supply. Essentially they are taking up the excess money that was left over when people decided they no longer needed it because they could use mobile payments.

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