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Q 1400 (This Is The Quantity of Caps Which Will Sell at Price of $6)

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Q1) The following relations describe the supply and demand for posters.

QD = 65,000 - 10,000P and QS = -35,000 + 15,000P where Q is the quantity and P is the
price of
a poster, in dollars.
Part a)

QD = 65,000 - 10,000P and QS = -35,000 + 15,000P


Price in $ Qd Qs Surplus Shortage
6 5000 55000 Surplus of 50000
5 15000 40000 Surplus of 25000
4 25000 25000 Equilibrium point
3 35000 10000 Shortage of 25000
2 45000 -5000 Shortage of 50000
1 55000 -20000 Shortage of 75000

Part b)
What is the equilibrium price?

QD = 65,000 - 10,000P and QS = -35,000 + 15,000P


Qd=Qs

65000-10000P=-35000+15000P

-15000P-10000P=-35000-65000

-25000P =-100000

P=-100000/-25000

P= $4

$4 IS THE EQULIBRIUM PRICE IN THIIS RELATION.

Q2) ABC Co, a store that sells various types of sports clothing and other sports items, is
planning to introduce a new design of Arizona Diamondbacks’ baseball caps. A
consultant has
estimated the demand curve to be Q = 2,000 - 100P
where Q is cap sales and P is price.
a. How many caps could ABC sell at $6 each?

Q=2000-100P
Q= 2000 – 100 (6)
Q= 1400 (This is the quantity of caps which will sell at price of $6)
b. How much would the price have to be to sell 1,800 caps?

Q = 2,000 - 100P
1800 = 2000 – 100P
100P = 2000-1800
P=200/100
P= $2 (AT THIS PRICE 1800 CAPS WILL SELL OUT)

c. Suppose ABC were to use the caps as a promotion. How many caps could ABC give
away free?
Q = 2,000 - 100P
Assume price “0” as we are giving away caps as promotion.

Q=2000-100(0)
Q = 2000 (THIS IS THE QUANITY OF CAPS WHICH ABC COMPANY CAN GIVE AWAY FREE)

d. At what price would no caps be sold?

Q = 2,000 - 100P

No caps be sold which Q=0

0= 2000-100P
100P= 2000-0
100P= 2000
P= 2000/100
P= $20 (At this price ABC would be not be able to sell any caps)

e. Calculate the point price elasticity of demand at a price of $6.

Q = 2,000 - 100P
For point price elasticity

∆Q/∆P * P/Q

From the equation we know that ∆Q/∆P is -100.

= -100* 6/1400. (Q at price $6 is 1400 as we have solved it above in part a)


= -0.42 (This is the point price elasticity at $6)

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