The market inverse demand curve is P = 90 – Q, where Q is the total market output consisting of Firm 1's output, q1, and Firm 2's output, q2. Both firms have a constant marginal cost of $10. If Firm 1 selects its output level first, how much output does each firm produce?

Firm 1 produces 40 and Firm 2 produce 20

Explanation:

Given that:

The market inverse demand curve is P = 90 – Q

Total TC = 10q + 10

and θ = q₁ + q₂

Both firms have a constant marginal cost

Then :

TC₁ = 10q₁ + 10

TC₂ = 10q₂ + 10

If Firm 1 selects its output level first, then it acts as a leader and firm 2 acts as a follower.

So, let have :

Ф₂  = pq₂  - TC₂

Ф₂  =  (90 - θ)q₂ - 10q₂ - 10

Ф₂  = 90q₂ - (q₁ + q₂)q₂  - 10q₂ - 10

Ф₂  =  80q₂  - q₁q₂ - q₂² - 10

80 - q₁ - 2q₂ = 0

80 - q₁ = 2q₂

2q₂= 80 - q₁

Ф₁ = pq₁- TC₁

Ф₁ = ( 90 - θ )q₁ - 10q₁ - 10

Ф₁  = 90q₁ - (q₁ + q₂)q₁  - 10q₁ - 10

Ф₁  = 80q₁ - q₁² - q₁q₂ - 10

Replace the value of q₂ in the above equation ,

40 - q₁= 0

q₁ = 40

Recall that

q₂ = 20

Firm 1 produces 40 and Firm 2 produce 20

answer; i believe a ( newsletter ) should be sent;

the page presents four different kinds of threats that volcanoes pose and what to do before, during, and after an eruption.