(i) With the aid of a labelled graph, explain what happens to equilibrium income and savings
when the society becomes thriftier as represented by a decline in C.
[4]
(ii) Why do you suppose this result is called the paradox of thrift?
[4]
(iii) Does this paradox arise in the classical model? Explain why or why not, with graphical
illustration.
[4]
(b) Consider a hypothetical closed economy described by the following equations:
Y=C+I+G
C = 50 + 0. 75(Y - T)
I= 150- lOr
(;f = Y- Sor
G = 250; T = 200; M = 3000; P = 4
(i) Derive an expression for the IS and the LM curve and determine the equilibrium levels of
income and interest rate
[6]
(ii) Graph and appropriately label and IS-LM curve, showing the equilibrium levels of income
and interest rate
[4]
(iii) Suppose a newly elected president cuts taxes by 20%. If the money supply is held
constant, what would be the new equilibrium levels of interest rate and income (where
necessary, round to one decimal place).
[3]
Question 3
[25 marks]
(a) The president of Mongovia is considering imposing a tariff on the import of Japanese luxury
cars. Assuming Mongovia is itself a producer of luxury cars, discuss the economics and politics
of the policy using an open-economy model. Specifically, discuss:
(i) how the policy would affect Mongovia's trade deficit and the exchange rate
[9]
(ii) the distributional effects of the policy-Le., who is hurt and who benefits?
[6]
(b) "Travelling to Mongovia is much cheaper than it was ten years ago", says Johannes. "Ten
years ago, a US dollar bought 10 Mongovian dollars; this year, a dollar buys 17 Mongovian
dollars". Is Johannes right or wrong? Given that the total inflation over this period was 25% in
the United States and 100% in Mongovia, has it become more or less expensive to travel to
Mongovia? Try to convince Johannes using a simple example, such as American hot dog versus
Mongovian biltong
[10].
3