Calculus Marginal Revenue to Total Revenue
Calculus
Marginal Revenue to Total Revenue
Aim
To demonstrate an application of integration.
Learning Outcomes
At the end of this section you will be able to:
? Identify a practical application of integration,
? Calculate the total revenue(TR) function from the marginal revenue(MR) function.
Marginal revenue is an important concept in basic microeconomics. Marginal revenue(MR) is the extra revenue that an additional unit of product will bring a firm. It
can also be described as the change in total revenue/change in number of units sold.
d
Therefore, M R =
(T R). From this we can conclude that
dQ
Z
M R dQ = T R
The very same relationship exists
Z between the marginal cost(MC) and the total
cost(TC) functions for the product, M C dQ = T C.
Example
If a marginal revenue function is given as M R = 10Q2 + 6Q ? 3, find an expression
for the total revenue function(TR).
We know
Z
M R dQ = T R
therefore
Z
(10Q2 + 6Q ? 3)dQ = 10
Q2
10
Q3
+6
? 3Q = Q3 + 3Q2 ? 3Q + C
3
2
3
Related Reading
Jacques, I. 1999. Mathematics for Economics and Business. 3rd Edition. Prentice Hall.
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