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# Micro And Macro Exercise Essay

2504 words - 11 pages

ECONOMICS FOUNDATION - MBA 502
Homework Assignments
Chu Nguyen Quynh Huong
Class: M0111

Assignment 1 – Microeconomics
1. The Basics of Supply and Demand (Pindyck – Chapter 2): Excercises 9, 10 (page 63).
Excercises 9:
a) The original demand is
QD =18-3P
And supply is
QS =-6+9P
The 20-percent increase in demand means that the new demand is 120 percent of the original demand, so the new demand is
Q ́D =1.2QD
Q ́D =1.2(18–3P)=21.6–3.6P.
The new equilibrium is where Q ́D equals the original supply: 21.6 – 3.6P = - 6 + 9P
The new equilibrium price is P* = \$2.19 per pound. An increase in demand of 20 percent, therefore, increases price by 19 cents per pound, or 9.5 percent.
b) ...view middle of the document...

Therefore, - 0.05 = - b(50/34), and b = 0.034, or 0.03 rounded off.
Substituting b = 0.03, D = 34, and P = 50 in the demand equation gives
34 = a - 0.03(50)
so that a = 35.5.
Hence the short-run world demand equation is D = 35.5 - 0.03P.
b) Do the same calculations as above but now using the long-run elasticities:
ES = 0.4
ED = - 0.4: ES = d(P*/Q*)
ED = - b(P*/Q*)
implying 0.4 = d(50/20)
⇨ 0.4 = - b(50/34).
So d = 0.16 and b = 0.27.
Next solve for c and a:
Sc = c + dP and D = a – bP
implying 20 = c + 0.16(50) and 34 = a - 0.27(50).
So c = 12 and a = 47.5.
c) OPEC’s supply increases from 14 bb/yr to 16 bb/yr as a result.
Add 16 bb/yr to the short- run and long-run competitive supply equations. The new total supply equations are:
Short-run: S’T=16 + Sc = 16 + 18 + 0.04P = 34 + 0.04P, and
Long-run: S”T= 16 + Sc = 16 + 12 + 0.16P = 28 + 0.16P
These are equated with short-run and long-run demand, so that:
34 + 0.04P = 35.5 - 0.03P
implying that P = \$21.43 in the short run
28 + 0.16P = 47.5 + 0.27P
implying that P = \$45.35 in the long run.

2. The Analysis of Competitive Markets (Pindyck – Chapter 9): Exercise 1 (page 343).
a) in free market equilibrium: Ls = LD = 80-10w
If the minimum wage is \$5: LD = 30
The number of people be employed is 30 million workers
b) w denote the wage received by the employee
Ls = 10ws
Ws – wd = 1 = s
LD = 80 – 10(ws-1) = 90 – 10ws
Ls = LD
⇨ 10ws = 90 – 10ws
⇨ ws = 4.5
The new equilibrium will be given by intersection of the old supply curve with the new demand curve, ws= \$4.5/ hour
L = 10w = 45

3. Theories of Production and Costs (Pindyck – Chapter 6 & 7): Exercise 8 (page 220); Exercise 1 (page 261)
Acounting cost = 40000+ 0 + 25000=65000
Economic cost = 40000+0+25000+ (50000-40000) + 24000 = 99000
Exercise 9 (page 262).
TC = 200 + 55q
A, the company’s fixed cost
q= 0 => TC = 200
⇨ FC = 200

b, if the company produce 100000 unit
q = 100000/1000 = 100
⇨ VC = 55q = 5500
⇨ AVC = vc/q = 55
c) AVC = constant => marginal cost MC = AVC
=> MC = 55

d, AFC = FC/q = 200/q
q= 100
⇨ AFC = 2

E, when the company borrow’s money
Fixed cost = FC’ = 50000
New variable cost = VC’ = 45000
⇨ AVC’ = 45
⇨ TC = 50 +45q +3i
4. Market Structures (Pindyck – Chapter 8 & 10):
Exercise 5 & 6 (page 307);
C = 50 +4q+2q2
MC = 4 + 4q
At the given market price of \$20
MC = MR = P
⇨ 4 +4q = 20
⇨ q = 40
the given is producing 5 unit => it is not maximizing it’s profit

when q = 4, the maximized profit = Pq – C = 20.4 – (50 +4.4 + 2q2) = -18
when q = 5, the profit == Pq- C = -20
The firm should decrease its quantity of output to 0 and exit the market in the long run.
Exercise 6 (page 388).
C = 100+2q2
MC = 4q
P = 90 – 2Q
MR = 90 – 4Q
A, the profit can maximized its profit when MR = MC
MC = (c/(q = 4q
⇨ q = 11.25
the monopoly quantity = 11.25
the monopoly price = P = 90 -2Q = 67.5
the level of...

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