Answer:-price changes
-inflation, negatively
-could not
Explanation: Completing the sentence, we have ;
Hayek is best known for his contribution to the understanding of Price Changes . Hayek disagreed with Keynes about expansionary policy because it could cause inflation and negatively influence consumer decisions. Unlike Keynes, Hayek believed that consumer actions could not be accurately displayed on a supply and demand curve.
------John Maynard Keynes and F.A. Hayek are two of the most controversial economic who made great contributions in the field of economics. In as much as they contributed great value to the economy system, they both had different thoughts in this regard, while Hayek says that government should not intervene to help market system, Keynes proposes on governments intervention to ease recession.