For the U.S. government, the expense that is not an example of discretionary spending is Medicare.
Discretionary fiscal policies are deliberate steps taken by the government to stimulate the economy in order to cause the economy to move to full employment and price stability more quickly than it might otherwise.
Here are the options:
Defense spending
Medicare
Science spending
To learn more about fiscal policies, please check: https://brainly.com/question/25716528
