<Li> Monetary (currency) union </Li> <Tr> <Td> Trade policy (show) <Ul> <Li> Balance of trade </Li> <Li> Free trade </Li> <Li> Gains from trade </Li> <Li> Non-tariff barrier </Li> <Li> Protectionism </Li> <Li> Tariff </Li> <Li> Trade bloc </Li> <Li> Trade creation </Li> <Li> Trade diversion </Li> <Li> Trade / commerce ministry </Li> </Ul> </Td> </Tr> <Ul> <Li> Balance of trade </Li> <Li> Free trade </Li> <Li> Gains from trade </Li> <Li> Non-tariff barrier </Li> <Li> Protectionism </Li> <Li> Tariff </Li> <Li> Trade bloc </Li> <Li> Trade creation </Li> <Li> Trade diversion </Li> <Li> Trade / commerce ministry </Li> </Ul> <Li> Balance of trade </Li>

Which of the following is an example of mandatory federal spending