Which aspects, if any, of monetarist or rational expectations theory have been integrated into mainstream macroeconomics?

What will be an ideal response?

Mainstream economists today largely accept the monetarist position that the money supply is an important variable affecting economic activity and that excessive growth over a long period of time can be inflationary. The notion of “crowding out” of private investment has been recognized as a weakness of expansionary fiscal policy without coordinated monetary policy. Finally, policy makers have become much more sensitive to expectations and the interaction of policy with particular markets in the macro economy.