ECON1010 Lecture Notes - Lecture 9: Perfect Competition, Marginal Cost, Market Power

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9 May 2018
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All diagrams come from Patricia Ramirez de la Vina’s powerpoint “Competitive Markets” Power Point Notes
Lecture 9 Notes - Competitive Market
Market Structures
An entrepreneur must determine a number of things
How much product to produce
What price to charge
How many workers to hire
When to exit or enter a market
Factors affecting decisions
How much competition there is
Thousands of producers is perfect competition
Many competitors is monopolistic competition
Few competitors is oligopoly
No competitors is monopoly
Costs
Perfect Market
Competitive market
Market in which there are many buyers and many sellers so that each has a
negligible impact on the market price
Many buyers and sellers
Individuals have no control over market price
Goods offered for sale are largely the same
Homogenous good
Firms can freely enter or exit the market
No barriers to entry
Eah uyer ad seller is a prie taker - have to take the market price as
given
Marginal Revenue (MR) = price for a competitive firm
MR = ΔTR/Δq
Change in Total Revenue from selling one more unit of output
Marginal Revenue = Change in total revenue divided by change in
output = Price
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Document Summary

All diagrams come from patricia ramirez de la vina"s powerpoint competitive markets power point notes. An entrepreneur must determine a number of things. When to exit or enter a market. Market in which there are many buyers and many sellers so that each has a negligible impact on the market price. Goods offered for sale are largely the same. Firms can freely enter or exit the market. Ea(cid:272)h (cid:271)uyer a(cid:374)d seller is a (cid:862)pri(cid:272)e taker(cid:863) - have to take the market price as given. Marginal revenue (mr) = price for a competitive firm. Change in total revenue from selling one more unit of output. Marginal revenue = change in total revenue divided by change in output = price. Total revenue (tr) = p x q. Average revenue (ar) = tr/q = p. Profit = marginal revenue (mr) - marginal cost (mc) When marginal revenue is greater than or equal to marginal cost, the firm is making a profit.

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