9. Consider a two-consumer, two-period economy. Consumers can buy and sell claims on consumption ; in period i = 1, 2 at unit price pa. Each consumer owns 1/2 units of the consumption good in all periods. The utility of consumer J = A, B from consumption path (1, 12 ) is max(21 , (2}. 2 (a) Derive a competitive equilibrium for this economy. (b) What is the real interest rate in this economy? Interpret your