Currency and Foreign Exchanges

In order to understand the global financial environment, how capital markets work, and their impact on global business, we need to first understand how currencies and foreign exchange rates work.

Briefly, currency is any form of money in general circulation in a country. What exactly is a foreign exchange? In essence, foreign exchange is money denominated in the currency of another country or – now with the euro – a group of countries. Simply put, an exchange rate is defined as the rate at which the market converts one currency into another.

Any company operating globally must deal in foreign currencies. It has to pay suppliers in other countries with a currency different from its home country's currency. The home country is where a company is headquartered. The firm is likely to be paid or have profits in a different currency and will want to exchange it for its home currency. Even if a company expects to be paid in its own currency, it must assess the risk that the buyer may not be able to pay the full amount due to currency fluctuations.

If you have traveled outside of your home country, you may have experienced the currency market – for example, when you tried to determine your hotel bill or tried to determine if an item was cheaper in one country versus another. In fact, when you land at an airport in another country, you're likely to see boards indicating the foreign exchange rates for major currencies. These rates include two numbers: the bid and the offer. The bid (or buy) is the price at which a bank or financial services firm is willing to buy a specific currency. The ask (or the offer or sell), refers to the price at which a bank or financial services firm is willing to sell that currency. Typically, the bid or the buy is always cheaper than the sell; banks make a profit on the transaction from that difference. For example, imagine you're on vacation in Thailand and the exchange rate board indicates that the Bangkok Bank is willing to exchange currencies at the following rates (see the following figure). GBP refers to the British pound; JPY refers to the Japanese yen; and HKD refers to the Hong Kong dollar, as shown in the following figure. Because there are several countries that use the dollar as part or whole of their name, this chapter clearly states "US dollar" or uses US$ or USD when referring to American currency.

This chart tells us that when you land in Thailand, you can use 1 US dollar to buy 31.67 Thai baht. However, when you leave Thailand and decide that you do not need to take all your baht back to the United States, you then convert baht back to US dollars. We then have to use more baht – 32.32 according to the preceding figure – to buy 1 US dollar. The spread between these numbers, 0.65 baht, is the profit that the bank makes for each US dollar bought and sold. The bank charges a fee because it performed a service – facilitating the currency exchange. When you walk through the airport, you'll see more boards for different banks with different buy and sell rates. While the difference may be very small, around 0.1 baht, these numbers add up if you are a global company engaged in large foreign exchange transactions. Accordingly, global firms are likely to shop around for the best rates before they exchange any currencies.