Final answer:
The equilibrium condition for a monopoly producing two outputs with linear demand functions is given by the equation P1 - P2 = 2, resulting in P1 = P2 = 5.
Step-by-step explanation:
The equilibrium condition for a monopoly producing two outputs, x1 and x2, with linear demand functions x1 = 10 - P1 and x2 = 8 - P2 can be found by setting the demand equal to the supply. So, we can equate the two demand functions:
10 - P1 = 8 - P2
By rearranging the equation, we get:
P1 - P2 = 2
The equilibrium condition is given by the equation P1 - P2 = 2, so the correct answer is d. P1 = P2 = 5.