ECON 3030 Chapter Notes - Chapter 10 and 12: Real Interest Rate, Net Present Value

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Econ 3030 - chapter 10 - intertemporal choice. Polonuis point - the point at which the consumer is neither a saver nor a borrower. Present value budget constraint: c1 + c2/(1 + r) = m1 + m2/(1 + r) (1 + r)c1 + c2 = (1 + r)m1 + m2. A consumer is a lender if their consumption in the rst period is less than income, i. e. p1c1 < m. A consumer is a borrower if their consumption in the rst period is greater than their income, i. e. p1c1 > m. If a consumer is originally a lender and the interest rate increases, the consumer must remain a lender. If a consumer is originally a borrower and the interest rate decrease, the consumer must remain a borrower p is the real interest rate where. 1 + p = (1 + r)/(1 + ) p = (r - )/(1 + )

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