A monopolist faces an inverse demand of p(y)=300-3y, and its total cost of production is c(y)=30y, where y is the output level. Calculate the x-intercept of the monopolist's marginal revenue curve.
Answer :
p(y) = 300 - 3y
This is the inverse demand curve faced by the monopolist
Revenue curve = p(y) * y = 300y - 3y^2
Marginal revenue we get by differentiating the revenue curve with respect to y
Thus : Marginal revenue = 300 - 6y
The MR curve is thus : MR = 300 - 6y
We get the x-intercept of this curve by making the left hand side to be zero.
So : 0 = 300 - 6y
6y = 300
y = 300/6 = 50
Answer : x-intercept of the monopolist's marginal revenue curve is 50
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