How to find a tax that maximizes government tax revenue?
Suppose the market can be described by the following equations:
Demand: P = 10 - Q
Supply: P = Q - 4
Using the given equations find the value of tax per unit that maximizes the government's total tax revenue.
Demand: P = 10 - Q
Q = 10 - P
Supply: P = Q - 4
Let the government imposes $t taxes on sellers
New price that sellers have to receive for their good = Ps + t
at equilibrium, Ps + t = Pd
Q - 4 + t = 10 - Q
2Q = 14 - t
Q = 7 - 0.5t
Total Tax Revenue = Q(t)*t
TR = 7t - 0.5t^2
First order condition,
dTR/dt = 0
7 - t = 0
t* = 7
value of tax per unit that maximizes the government's total tax revenue.= $7
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