Suppose that you need to buy 6 pounds using French francs. If you buy 6 pounds directly in the foreign exchange market, it will cost you 13.2 francs. Alternatively, you can first buy an ounce of gold for 12 francs in France and then ship it to England and sell it for 6 pounds. In this case, it only costs you 12 francs to buy 6 pounds. It is thus beneficial to ship gold due to the overpricing of the pound. Of course, you can make an arbitrage profit by selling 6 pounds for 13.2 francs in the foreign exchange market. The arbitrage profit will be 1.2 francs. So far, we assumed that shipping costs do not exist. If it costs more than 1.2 francs to ship an ounce of gold, there will be no arbitrage profit.