Consider an exchange economy with three commodities and two consumers. Assume that each consumer i = 1,2 has the same endowment wo = (k, k, k) where k is a positive constant. Also, assume that each consumer's preference over the commodities is represented by the following quasilinear utility function: u(x) = x + 2xx. That is, u(x); = x+2xx and u(x) = x + 4xzxz. (a) Assuming an interior solution, compute the excess demand function for each commodity. (b) Show that Walras' law holds. (c) Find the Walrasian equilibrium allocation x* and equilibrium prices p* for this exchange economy, and discuss whether the equilibrium allocation is Pareto efficient.