ECON 102 Lecture Notes - Lecture 10: Marginal Cost, Marginal Product, Production Function

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9 Apr 2019
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Lecture Notes
Lecture 10
Costs of Production
Total Revenue, Total Cost, Profit
We assume that the firm’s goal is to maximize profit
Profit = total revenue – total cost
Total revenue - amount a firm receives from the sale of its output
Total cost - market value of the inputs a firm uses in production
Costs: Explicit vs. Implicit
Explicit costs - require an outlay of money
Ex. Paying wages to workers
Implicit costs - do not require a cash outlay
Ex. Opportunity cost of the owners time
Cost of something is what you give up to get it
True whether the costs are implicit or explicit
Economic Profit vs. Accounting Profit
Accounting profit = total revenue – total explicit costs
Economic profit = total revenue – total costs (including explicit and implicit costs
Accounting profit ignores implicit costs, so it’s higher than economic profit
Production Function
Production function - shows the relationship between the quantity of inputs used to produce a good and the
quantity of output of that good
Can be represented by a table, equation, or graph
Marginal Product
Marginal product of any input - increase in output arising from an additional unit of that input, holding all other
inputs constant
= ‘change in’
Marginal product of labor (MPL) = Q / L
Why MPL is Important
Rational people think at the margin
When farmer Jack hires an extra worker:
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Document Summary

We assume that the firm"s goal is to maximize profit. Total revenue - amount a firm receives from the sale of its output. Total cost - market value of the inputs a firm uses in production. Explicit costs - require an outlay of money. Implicit costs - do not require a cash outlay. Cost of something is what you give up to get it. True whether the costs are implicit or explicit. Accounting profit = total revenue total explicit costs. Economic profit = total revenue total costs (including explicit and implicit costs. Accounting profit ignores implicit costs, so it"s higher than economic profit. Production function - shows the relationship between the quantity of inputs used to produce a good and the quantity of output of that good. Can be represented by a table, equation, or graph. Marginal product of any input - increase in output arising from an additional unit of that input, holding all other inputs constant.

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