9.20 E Intertemporal Budget Constraint We assumed that the interest rate is r whether Cookie Monster is a debtor or creditor. Suppose instead that the saving rate is rs and the borrowing rate is rb(:> r5). Sketch the budget constraint. (c0, c1) = (ya t0, yl :1) should still be on the budget line because Cookie Monster doesn't save or borrow at this point, and thus the interest rates, whatever they are, have no bearing on this bundle. Take this bundle as your point of departure