Econ 100b

Created 4/30/1996
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Practice Midterm One

First midterm to be given March 8
Economics 100b; Spring 1996; Brad DeLong

Part I (Short answers; one paragraph each; 20 minutes)

1. Why is it thought that the consumer price index, as presently calculated, overstates the rate of inflation?

2. What is the difference between real and nominal GDP?

3. Will income and production in the IS-LM model rise or fall if (a) the Federal Reserve decreases the money supply, and (b) taxes rise? Why?

4. In the long run, does an increase in government spending (holding taxes fixed) raise or lower private investment? Why?

5. What is the largest sub-category of net national product? What is the largest sub-category of national income?

Part II (20 minutes)

Suppose that the consumption function (in billions of dollars) is:

C = 800 + 0.75(Y-T)

and, further, suppose that total net taxes and transfers T are not a lump sum amount, but that instead:

T = .2 x Y

and that the investment function is:

I(r) = 1300 - 100(r)

(a) Solve for output and income Y as a function of G, r, and the parameters of the model;

(b) Assume that the Federal Reserve holds the real interest rate constant at 3 percent, and that government spending G is fixed at 1,000; solve numerically for output and income Y;

(c) Suppose G is raised to 1,001; by how much does Y increase?

(d) The marginal propensity to consume c' in this version of the model is 0.75; thus the simple multiplier 1/(1-c') in this version of the model is 4. Explain why there is a discrepancy between the simple multiplier and your answer to part (c).

Part III (Identifications; one sentence each; 20 minutes)

1. Consumer price index

2. GDP deflator

3. Marginal propensity to consume

4. Government taxes less transfers

5. Government purchases of goods and services

6. Multiplier

7. IS curve

8. Production function

9. Diminishing returns

10. Quantity theory of money

Extra Credit/General Education

1. From which emperor did the University of Bologna receive its charter in 1158? What was he emperor of?


Econ 100b

Created 4/30/1996
Go to
Brad De Long's Home Page

Professor of Economics J. Bradford DeLong, 601 Evans
University of California at Berkeley
Berkeley, CA 94720-3880
(510) 643-4027 phone (510) 642-6615 fax