1. Two profit-maximising firms call them firm 1 and firm 2- compete in quantities. Before the firms choose their quantities, firm 1 has the option to spend money on advertising, which allows differentiating the two products. That is, firm 1 chooses a € [0, 1] (i.e., 0≤ a ≤ 1) and pays ca, with c> 0. The two firms then face the following inverse demand functions: P₁ = 1-q₁-(1-a)q2 and p2=1-92-(1-a)g₁. There is no cost of production so the profit of firm 1 is #1 = P191-ca and the profit of firm 2 is #2 = P292- (a) (c) (b) Without doing any calculation, briefly explain what the market struc- ture would be if firm 1 one chose not to advertise at all (a = 0) and if it chose the maximal amount of advertising (a = 1). [max: 50 words] For any value of a € [0, 1], calculate the equilibrium quantities. Calculate the optimal level of advertising for firm 1.

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Chapter1: Making Economics Decisions
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1. Two profit-maximising firms call them firm 1 and firm 2- compete in quantities.
Before the firms choose their quantities, firm 1 has the option to spend money on
advertising, which allows differentiating the two products. That is, firm 1 chooses
a € [0, 1] (i.e., 0≤ a ≤ 1) and pays ca, with c> 0. The two firms then face the following
inverse demand functions:
P₁ = 1-q₁ (1-a)q2 and p2=1-92-(1-a)9₁.
There is no cost of production so the profit of firm 1 is #₁ = pigi - ca and the profit of
firm 2 is #2 = P292.
(a)
(c)
(d)
(b)
Without doing any calculation, briefly explain what the market struc-
ture would be if firm 1 one chose not to advertise at all (a = 0) and if it chose the
maximal amount of advertising (a = 1). [max: 50 words]
For any value of a € [0, 1], calculate the equilibrium quantities.
Calculate the optimal level of advertising for firm 1.
Briefly provide intuition for your results. [max: 50 words]
And here is an example. When solving for the question given above, You can refer to the
format:
There are three profit-maximising firms that compete in prices. Each firm i = 1,2,3
produces good i and faces the demand function qi= 12-3pi+ji Pj. For each firm i,
the cost of producing a quantity q is cq, where c₁ = 2, c2 = 4, and c3 = 6.
(a) Find the equilibrium prices and quantities.
(b) Suppose that firms 2 and 3 merge to become firm A and that their merger results
in efficiency gains that halve the cost of producing goods 2 and 3; that is, c₂ = 2
and c3 = 3. Calculate the new equilibrium prices and quantities.
(c) How much profit did the merger generate for the firms involved?
(d) i. Did the outsider (firm 1) benefit from the merger?
ii. Provide intuition for your result in (i). [max: 50 words]
(e) Without doing any additional calculations, determine whether a competition au-
thority would be likely to block this merger. [max: 50 words]
Transcribed Image Text:1. Two profit-maximising firms call them firm 1 and firm 2- compete in quantities. Before the firms choose their quantities, firm 1 has the option to spend money on advertising, which allows differentiating the two products. That is, firm 1 chooses a € [0, 1] (i.e., 0≤ a ≤ 1) and pays ca, with c> 0. The two firms then face the following inverse demand functions: P₁ = 1-q₁ (1-a)q2 and p2=1-92-(1-a)9₁. There is no cost of production so the profit of firm 1 is #₁ = pigi - ca and the profit of firm 2 is #2 = P292. (a) (c) (d) (b) Without doing any calculation, briefly explain what the market struc- ture would be if firm 1 one chose not to advertise at all (a = 0) and if it chose the maximal amount of advertising (a = 1). [max: 50 words] For any value of a € [0, 1], calculate the equilibrium quantities. Calculate the optimal level of advertising for firm 1. Briefly provide intuition for your results. [max: 50 words] And here is an example. When solving for the question given above, You can refer to the format: There are three profit-maximising firms that compete in prices. Each firm i = 1,2,3 produces good i and faces the demand function qi= 12-3pi+ji Pj. For each firm i, the cost of producing a quantity q is cq, where c₁ = 2, c2 = 4, and c3 = 6. (a) Find the equilibrium prices and quantities. (b) Suppose that firms 2 and 3 merge to become firm A and that their merger results in efficiency gains that halve the cost of producing goods 2 and 3; that is, c₂ = 2 and c3 = 3. Calculate the new equilibrium prices and quantities. (c) How much profit did the merger generate for the firms involved? (d) i. Did the outsider (firm 1) benefit from the merger? ii. Provide intuition for your result in (i). [max: 50 words] (e) Without doing any additional calculations, determine whether a competition au- thority would be likely to block this merger. [max: 50 words]
1. (a) The profit of firm 1 is
The first-order condition gives
The profit of firm 2 is
The profit of firm 3 is
₁ (123p1 + P2 + P3) (P12)
=
071
дру
6p₁ = P2 + P3 + 18.
The first-order condition gives
= −3p₁ +6+12 - 3p1 + P2 +P3 = 0
T2 (12-3p2 + P₁+P3) (P24)
On1
др1
6p2 = P1+P3 + 24.
TA =
=
The first-order condition gives
-3p2+12+12-3p2 + P₁+P3 = 0
T3 = (12-3p3 + P1+P2) (P3-6)
Әлз
Op3
6p3 = P1+P2 + 30.
= 92(P2 − 2) + 93 (P3 − 3) =
= -3p3 +6+12-3p3 +P1+P2 = 0
(3)
Using Wolfram Alpha to solve the system of linear equations (1)-(3) for p₁, p2, and
P3 gives
(P1, P2, P3) =
The equilibrium quantities are
36 48
,6,
108
91 = 12-3p1 +p2 + P3 = 12-
7
92 = 12-3p2 + P1+P3 = 12-18+
(e) The joint profit of firms 2 and 3 before the merger is
7₂ +3 = 92₂(P2 - 4) + 93 (P3 − 6) =
The profit of firm A after the merger is
76 141 54 119
+
11 44 11 44
The profit generated by the merger is
8571 696
242 49
36
7
93 = 12-3p3 + P1 + P2 = 12 - + +6=
144 36
7 7
= 6-2+
≈(5.14, 6, 6.86).
251, 547
11,858
=
+6+
186 696
77 49
21.21.
48 66
8787
+
18
(91,92,93)= (60,6, 1/0) ≈ (9.43, 6, 2.57).
48
= 6
14.20.
10716 6426 8571
+
484 484 242
18
9.43
2.57
(1)
≈35.42.
Transcribed Image Text:1. (a) The profit of firm 1 is The first-order condition gives The profit of firm 2 is The profit of firm 3 is ₁ (123p1 + P2 + P3) (P12) = 071 дру 6p₁ = P2 + P3 + 18. The first-order condition gives = −3p₁ +6+12 - 3p1 + P2 +P3 = 0 T2 (12-3p2 + P₁+P3) (P24) On1 др1 6p2 = P1+P3 + 24. TA = = The first-order condition gives -3p2+12+12-3p2 + P₁+P3 = 0 T3 = (12-3p3 + P1+P2) (P3-6) Әлз Op3 6p3 = P1+P2 + 30. = 92(P2 − 2) + 93 (P3 − 3) = = -3p3 +6+12-3p3 +P1+P2 = 0 (3) Using Wolfram Alpha to solve the system of linear equations (1)-(3) for p₁, p2, and P3 gives (P1, P2, P3) = The equilibrium quantities are 36 48 ,6, 108 91 = 12-3p1 +p2 + P3 = 12- 7 92 = 12-3p2 + P1+P3 = 12-18+ (e) The joint profit of firms 2 and 3 before the merger is 7₂ +3 = 92₂(P2 - 4) + 93 (P3 − 6) = The profit of firm A after the merger is 76 141 54 119 + 11 44 11 44 The profit generated by the merger is 8571 696 242 49 36 7 93 = 12-3p3 + P1 + P2 = 12 - + +6= 144 36 7 7 = 6-2+ ≈(5.14, 6, 6.86). 251, 547 11,858 = +6+ 186 696 77 49 21.21. 48 66 8787 + 18 (91,92,93)= (60,6, 1/0) ≈ (9.43, 6, 2.57). 48 = 6 14.20. 10716 6426 8571 + 484 484 242 18 9.43 2.57 (1) ≈35.42.
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