ECO200Y1 Lecture 17: Money

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We will work with a simplified cash-in-advance model, which assumes money is necessary for transactions. P and p"--> current and future price levels (the price of consumption goods in terms of money) An asset that sells for 1 unit of money in the current period and pays i+r units of money in the future period. The rate of change of the price level (or the rate of return of a bond in units of money) I = (p" p)/p p"/ p = 1 + i. Using a credit card costs q per unit of credit. Quantity of goods purchased with credit card services: xd(q) Quantity of goods purchased with money: y xd(q) If p(1 + r) > p(1 + q), all goods are purchased with credit cards. If p(1 + r) < p(1 + q), all goods are purchased with money. Thus p(1 + r) = p(1 + q) in equilibrium, implying q = r.

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