ECON1101 Chapter Notes - Chapter 9: Market Power, Competitive Equilibrium, Opportunity Cost

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21 May 2018
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Chapter 9
Total economic cost: sum of opportunity cost of all inputs including implicit
cost
Implicit cost of capital is the opportunity cost of financial capital invested in firm
Industry: group of firms producing a similar product
Long run competitive equilibrium model: A model of firms in an industry in
which free entry and exit produce an equilibrium such that price equals the
minimum of average total cost
Economic profits are zero P=ATC normal economic profits
revenue covers all economic costs and provides normal rate of return
on financial/physical capital investments
Benefits:
1. ATCLR is minimised
2. Capital is allocated efficiently
Graph 1. Shows individual firm as a price taker
Graph 2. Shows how demand is affected by change in market price
Both graphs occur simultaneously
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Free entry and exit: movement of firms in and out of an industry that is not
blocked by regulation, other firms or any other barriers.
In the LR,
o At the firm level, firms can alter input K (capital stock)
o At the market level, the number for firms can vary
Firms enter when firms receive SR profits (P> min ATCLR)
Firms exit when firms make SR losses (P< min ATCLR)
If entry increases supply curve shifts to the left and vice versa.
Accounting profits: total revenue total costs, where total costs exclude the
implicit opportunity costs; this is the definition of profits usually reported by
firms
Economic profits: total revenue total costs, where total costs include
opportunity costs, whether implicit or explicit
Normal profits: the amount of accounting profits when economic profits are
equal to zero
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Document Summary

Total economic cost: sum of opportunity cost of all inputs including implicit cost. Implicit cost of capital is the opportunity cost of financial capital invested in firm. Industry: group of firms producing a similar product. Shows how demand is affected by change in market price. Free entry and exit: movement of firms in and out of an industry that is not blocked by regulation, other firms or any other barriers. If entry increases supply curve shifts to the left and vice versa. Accounting profits: total revenue total costs, where total costs exclude the. Economic profits: total revenue total costs, where total costs include implicit opportunity costs; this is the definition of profits usually reported by firms opportunity costs, whether implicit or explicit. Normal profits: the amount of accounting profits when economic profits are equal to zero. Result: increase firms in industry, lr output > sr output, price back to min atclr and zero economic profits.

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