1) in each case below, determine which curve is shifted and the direction of shift of the curve (to the right, to the left, not shifted) a) real interest rates increase b) the marginal tendency to use increases c) the stock market price decreases d) the price level increases e) the statutory proposal ratio decreased f) the government provides tax incentives for research and development programs for firms (24 MARKS) each question consists of 4 marks please give explanation in detail.