What does this all mean? It means that each year mandatory spending tends to increase because of programs like Social Security and Medicare, while discretionary spending decreases. Members of Congress have less money to spend on programs they choose because they must spend more on programs that are written into law. Remember as you write your bill that the committee that considers it may not pass it if they feel it is too expensive. Based on what you have read, would the bill you plan to write fall into the category of mandatory spending or discretionary spending?