Functional theory is optimistic.
It says that each level of the federal system is well designed to carry out the tasks for which it is mainly responsible. They shift unpopular burdens to lower levels of government while spending national dollars on popular government programs for which they can claim credit. Both theories are used to explain different aspects of American federalism. Legislative theory explains why federal grants have never been used to equalize public services. Elected officials cannot easily justify to their constituents a vote to shift funds away from the geographic area they represent.