February 2016
Beginner to intermediate
500 pages
33h 40m
English
We use math to determine the cola market Nash-Bertrand equilibrium discussed in the text. First, we determine the best-response functions each firm faces. Then, we equate the best-response functions to determine the equilibrium prices for the two firms.
Coke’s best-response function tells us which price Coke sets to maximize its profit as a function of the price Pepsi charges. We use the demand function for Coke to derive its best-response function.
The reason Coke’s price depends on Pepsi’s price is that the quantity of Coke demanded, [&q_{c},&] depends on the price of Coke, [&p_{c},&] and the price of Pepsi, [&p_{p}.&] Coke’s demand function is
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