Explain and sketch a person's indifference map for two goods X and Y. Mark the optimum consumption point. Now illustrate and explain the following

A) a rise in the price of good X, but no change in the price of good Y

B) a shift in the person's tastes from good Y to good X

C) a fall in the person's income and a fall in the price of good Y, with the result that the consumption of Y remains constant but that of X falls