Which of the following events would strengthen the argument for the use of discretionary policy, and which would strengthen the argument for rules? Explain your answer.

1. Structural changes make the economy's self-correcting mechanism work more quickly and reliably than before.
2. New statistical methods are found that improve the accuracy of economic forecasts.
3. A Democratic Congress is elected when there is a Republican president. Congress and the president differ sharply on what should be done about the national economy.