When jack and jill use dollars to compare the market values of their cellphones, money is acting as a

1. store of value.
2. unit of account.
3. medium of exchange.
4. standard of deferred payment.

Which of the following would shift the aggregate demand curve to the right?

1. an increase in input prices
2. an increase in taxes
3. a decrease in intrest rates by the FED.
4. an increase in interest rates