CAS EC 101 Lecture Notes - Lecture 11: Network Effect, Demand Curve, Fixed Cost

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Firmsā€™ Costs
ā€¢ TC ā€“ total cost of producing a good
ā€¢ AC ā€“ average cost of producing a good (TC/q)
ā€¢ MC ā€“ additional cost of producing an additional good (change in TC/change in q)
ā€¢ TR ā€“ total revenue from a good (p x q)
ā€¢ AR ā€“ average revenue from a good (p)
ā€¢ MR ā€“ additional revenue from an additional good (change in TR/change in q)
ā€¢ TC = TFC + TVC
ā€¢ AC = AFC + AVC
ā€¢ TFC ā€“ found when q = 0
ā€¢ AFC ā€“ TFC/q
ā€¢ AVC ā€“ TVC/q (found by subtracting AC ā€“ AFC)
ā€¢ MC = MVC
ā€¢ MVC = change in TVC/change in q
ā€¢ Fixed Costs ā€“ costs that vary without output
ā€¢ Variable Costs ā€“ costs that vary with output
ā€¢ Shut down if AVC > price
ā€¢ Profits from continuing to operate = TC ā€“ TFC ā€“ TVC
ā€¢ Profits from shutting down = -TFC
Perfectly Competitive Firm
ā€¢ 0 long run economic profit
ā€¢ When there are profits, supply curve shifts right which brings the price down to minimum
AC
ā€¢ When there are losses, supply curve shifts left which brings the price up to minimum AC
ā€¢ Many firms producing identical products
ā€¢ Price takers
ā€¢ P = D = MR = AR
ā€¢ No advertising
ā€¢ Firms sell as much as they produce
ā€¢ No barriers to entry/exit
ā€¢ ex: wheat or agriculture
ā€¢ Entry = MR > AC
ā€¢ Exit = MR < AC
ā€¢ Profit Maximization ā€“ P = MR ā‰„ MC (discontinuous quantities) or P = MR = MC
(continuous quantities)
Monopoly
ā€¢ Barriers to entry/exit
ā€¢ 1 firm producing a unique good (government monopoly, source of supplies, monopoly
over time, network externalities)
ā€¢ Profit Maximization ā€“ P > MR = MC
ā€¢ Downwards sloping demand curve
ā€¢ Downwards sloping MR curve that is twice as steep
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CAS EC 101 Full Course Notes
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