The stock PolarBear trades on both the South Pole Stock Exchange and the North Pole Stock Exchange.
(a) Suppose the price on the North Pole is $18. What does the No-Arbitrage Condition say about the price on the South Pole? (Assume no trading costs.)
(b) Suppose the price on the North Pole is $18 and the price on the the South Pole is $17? How can you make an arbitrage profit? (Assume no trading costs.)
(c) Suppose that the price on the North Pole is $18, that buying or selling on the North Pole costs $2, and that buying or selling on the South Pole is free. What does the No-Arbitrage Condition say about the price on the South Pole?