ECON 291 Study Guide - Quiz Guide: Loanable Funds, Real Interest Rate, Marginal Product

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Econ 291 Tutorial Questions Ch.2
1
Name Student ID #
1. Explain how a competitive, profit-maximizing firm decides how much of each factor of
production to demand.
A competitive profit-maximizing firm hires labor until the marginal product of labor equals
the real wage, and rent capital until the marginal product of capital equals the real rental
price.
2. What is the role of constant returns to scale in the distribution of income?
If the production function has constant returns to scale, then total income (or equivalently,
total output) in an economy of competitive profit-maximizing firms is divided between the
return to labor and the return to capital. That is, under constant returns to scale, economic
profit is zero.
3. What makes the demand for the economy’s output of goods and services equal the supply?
Consumption, investment, and government purchases determine demand for the economy’s
output, whereas the factors of production and the technology determine the supply of output.
The real interest rate adjusts to ensure that the demand for the economy’s goods equals the
supply. At the equilibrium interest rate, the demand for goods and services equals the supply.
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Econ 291 Tutorial Questions Ch.2
2
4. Suppose the production function in medieval Europe is Y = L0.5N0.5, where L is the amount
of land and N is the amount of labour. The economy begins with 100 units of land and 100
units of labour.
a. How much output does the economy produce?
Y = L0.5N0.5 = 1000.5 Ă— 1000.5 = 100
b. What are the real wage and the real rental price of land?
Real wage = MPN = 0.5Ă— L0.5N-0.5 = 0.5
Real rental price of land = MPL = 0.5Ă— L-0.5N0.5 = 0.5
c. What fraction of output does labour receive?
Labour’s share of output = 0.5 = 50%
d. If a plague kills half the population, what is the new level of output?
Y = L0.5N0.5 = 1000.5 Ă— 500.5 = 70.71
e. Refer to part d. What is the new real wage and real rental price of land?
Real wage = MPN = 0.5Ă— L0.5N-0.5 = 0.707
Real rental price of land = MPL = 0.5Ă— L-0.5N0.5 = 0.354
f. Refer to part d. What fraction of output does labour receive now?
Labour’s share of output = 0.5 = 50%
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Document Summary

Student id : explain how a competitive, profit-maximizing firm decides how much of each factor of production to demand. If the production function has constant returns to scale, then total income (or equivalently, total output) in an economy of competitive profit-maximizing firms is divided between the return to labor and the return to capital. Consumption, investment, and government purchases determine demand for the economy"s output, whereas the factors of production and the technology determine the supply of output. The real interest rate adjusts to ensure that the demand for the economy"s goods equals the supply. At the equilibrium interest rate, the demand for goods and services equals the supply. Ch. 2: suppose the production function in medieval europe is y = l0. 5n0. 5, where l is the amount of land and n is the amount of labour. Real wage = mpn = 0. 5 l0. 5n-0. 5 = 0. 5. Real wage = mpn = 0. 5 l0. 5n-0. 5 = 0. 707.

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