ECO 3152 Lecture Notes - Lecture 11: Real Interest Rate, Budget Constraint, Disposable And Discretionary Income

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The real intertemporal model: how real aggregate output, real consumption, investment, employment, the real wage and the real interest rate are determined in the macroeconomy. Intertemporal refers to the fact that consumers face tradeoffs between the present and future. When a firm invests it forgoes current profits which allows it to earn higher future profits: more investment = lower current capital stock, higher tfp and lower real interest rat. A key determinant of investment is the real interest rate: opportunity cost of investment, high real interest rate - large opportunity cost for investment --> investment falls. In addition to the market interest rates, investment decisions of firms depend on credit market risk as perceived by lenders: more difficult to borrow to invest in risky lending. Consumer will make a work-leisure decision in the current and future periods, and he or she will make a consumption savings decision in the current period.

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