It is common in economics to model the decisions households make today as a function of lifetime consumption and earnings. The starting point of these models is the two-period model. The setup is as follows: The household exists for two periods, present (t) and future (t+1). Lifetime income is known with full certainty, with income today Y and future income Y+1 used for consump- tion C, and Ct+1. In the first period households can save S, at real interest rate rt, yielding (1 + rt)S, in additional future income. Borrowing in period 1 is built into the model if S, 0. discuss the implications for lifetime consumption, savings/borrowing, and the intertemporal tradeoff between periods. Is your answer to Q3 different when wealth is involved