EXAMINATION PAPER
Examination Session:
May/June
Year:
2020
Exam Code:
ECON2011-WE01

Title: MACROECONOMICS

Time Allowed: 1 hour 30 minutes
Additional Material provided: None
Materials Permitted: None
Calculators Permitted: No
Visiting Students may use dictionaries: Yes

Instructions to Candidates: This exam consists of two parts each carrying 50% of the overall
mark. Answer all sections from part A and two questions from
part B.

Each question and each sub-part of a question is equally
weighted unless otherwise stated

Revision:

Page 2 of 3 ECON2011-WE01

Part A
Answer ALL sections:

1. a) Given a Lucas surprise supply function = ̅ + ( − ) + (where  is an unbiased
random shock), assume that the policy maker minimises a loss function of the form: =
[ − (̅ + )]2 + 2( − ∗)2. In equilibrium are the expected rate of inflation e and the ideal
one  going to be the same and if not by how much will they differ?
b) Assuming an open economy where wage bargaining finds its equilibrium independently of
import prices (which implies a vertical ERU curve as in Carlin & Soskice 2014), and ignoring
short-term dynamics, illustrate with a diagram how the medium-run equilibrium real
exchange rate is affected by a permanent positive supply shock.
c) Derive the change in technology in a Real Business Cycle model by means of the Solow
residual, assuming the following production function: =

1−

d) An agent lives for 2 periods and gains utility from consumption. The agent discounts future
consumption at rate ρ where 0< ρ <1. The agent consumes and saves at interest rate
in the first period of life from income w. In the second period, the agent consumes from an
income w as well as savings plus interest earned.
i. Find the Euler equation for this agent.
ii. Explain and show on a diagram what happens to the path of consumption when r
decreases.

Part B

2. Consider a government dynamic budget constraint in debt to GDP terms.

a) Why is the stability of this equation a matter of concern?
b) How do rating agencies affect the equation and its stability?
c) This approach maintains that the government budget constraint is effectively comparable to
that of a household. What insight do we gain from such a comparison and what are its
limitations?

3. Consider a model of an economy with an explicit banking sector as in Howells (2009).

a) What problems does the existence of the Zero Lower Bound in the setting of the policy rate
create?
b) How can we introduce balance sheet liquidity considerations and the effect of securities
markets?
c) Why would Minsky maintain that such a financial structure inevitably generates cycles?

4. Consider a Real Business Cycles model of the economy.

a) What are its defining assumptions?
b) How does it fare in terms of internal and external consistency?
c) Why do some economists consider it implausible as an explanation of observed cycles?

CONTINUED
Page 3 of 3 ECON2011-WE01

5. Consider the economy described in part A section d.

a) The agent described is now embedded in an Overlapping Generations model. Solve the
representative agent’s problem. Describe how agents “overlap” within this framework.
b) Solve the firm’s problem by finding the factor remunerations of capital and labour.
c) Find the competitive equilibrium of this model.

6. Consider a micro-founded model of the Macro-economy where agents are endowed with
Rational Expectations.

a) Why are some economists dissatisfied with the answers such a model provides?
b) Does Complexity theory fare any better?
c) Does Post-Keynesian theory fare any better?

END  Email:51zuoyejun

@gmail.com