What is Cable
Cable is a slang term for the exchange rate between the U.S. dollar and the British pound sterling. The term is used among forex traders and can also refer to the British pound sterling. Since the pound versus the dollar is one of the most commonly traded currency pairs, the term is heard frequently in trading rooms.
BREAKING DOWN Cable
Cable only refers to the British pound with reference to prices and trading against the dollar. Quotes against other currencies such as the euro or the Japanese yen refer to the pound as sterling, as in "I need a price in sterling/yen" or "I think euro/sterling will rebound from its current lows." The abbreviation for the pound is GBP, which stands for Great Britain pound. You may hear someone dealing in the forex market say "Cable is up today" or "Cable has been trending lower lately." This term supposedly derives from the advent of the telegraph in the mid-19th century. The pound was the dominant currency at the time, and transactions between the pound and dollar were executed via transatlantic cable. Forex traders are sometimes referred to as "cable dealers."
Dominant Currency Until Post-World War II Period
The British pound or pound sterling is considered the oldest currency still in use. It was the world's dominant currency for centuries, and thus was considered the primary reserve currency in which other nations held their excess cash. As the British Empire dominated global commerce, the pound dominated international finance. It was legal tender in most colonies, including large portions of Africa and Asia. The Empire began to fade following World War I, as the enormous economic cost of the war took a toll on the economy. With the British government heavily in debt to the United States, the dollar began to assume the reserve currency status that the pound previously held. This change was complete by 1949, when the British government was forced to devalue the pound by 30.5%. By the early part of the 21st century, the dollar was the world's leading reserve currency, followed by the euro. According to the International Monetary Fund (IMF), the pound, or cable, has settled into fourth place as of the third quarter of 2017, trailing the Japanese yen.
In foreign exchange, the base currency is the one against which all others are compared. When the pound was the world's dominant currency, it was also the base currency for trading, so a price quote indicated the amount of currency X that needed to be exchanged for the pound. It is still the base currency in trades against the U.S. dollar, Canadian dollar and Japanese yen, among others. But when the euro started trading on Jan. 1, 1999, it took over base currency status for any combination in which it was traded. Pricing for cable is thus the number of dollars it takes to buy one pound. But a price in euro/sterling is the number of pounds it takes to buy one euro.