The Consumer Sentiment Index (CSI) is published every month based on a survey of thousands of representative U.S. households. It is used by many economists to track the state of the economy. A press release by the Board on March 31, 2023, stated: "The CSI increased slightly in March, following an increase in February. The Index now stands at 104.2, up from 103.4 in February.

a. Explain your answer to part a with the help of the AD-AS model. Draw a typical diagram showing two equilibrium points (E1) and (E2). Label the vertical axis "Price" and the horizontal axis "Real GDP." Assume that all other major macroeconomic factors remain unchanged