Which term is used to describe equilibrium at a level of output above potential GDP?

"Buy low and sell high is advice given to people who want to make a profit by buying and selling shares of stock. Arbitrage is defined as buying a product in one market at a low price and reselling it in another market at a high price

Therefore, when stock brokers buy and sell stocks to earn a profit they are engaging in arbitrage." Evaluate this statement; state whether it is true or false and explain your answer.

Under the Exchange Rate Mechanism of the European Monetary System, when the British pound depreciated below its lower limit against the German mark, the German central bank was required to buy ________ and sell ________,

thereby ________ international reserves. A) pounds; marks; losing B) pounds; marks; gaining C) marks; pounds; gaining D) marks; pounds; losing