The Eurocurrency markets originated in the 1950s when communist governments in Eastern Europe became concerned that any deposits of their dollars in US banks might be confiscated or blocked for political reasons by the US government. These communist governments addressed their concerns by depositing their dollars into European banks, which were willing to maintain dollar accounts for them. This created what is known as the Eurodollar—US dollars deposited in European banks.
Over the years, banks in other countries, including Japan and Canada, also began to hold US dollar deposits and now Eurodollars are any dollar deposits in a bank outside the United States. (The prefix Euro- is now only a historical reference to its early days.) An extension of the Eurodollar is the Eurocurrency, which is a currency on deposit outside its country of issue. While Eurocurrencies can be in any denominations, almost half of world deposits are in the form of Eurodollars.
The Euroloan market is also a growing part of the Eurocurrency market. The Euroloan market is one of the least costly for large, creditworthy borrowers, including governments and large global firms. Euroloans are quoted on the basis of LIBOR, the London Interbank Offer Rate, which is the interest rate at which banks in London charge each other for short-term Eurocurrency loans.
The primary appeal of the Eurocurrency market is that there are no regulations, which results in lower costs. The participants in the Eurocurrency markets are very large global firms, banks, governments, and extremely wealthy individuals. As a result, the transaction sizes tend to be large, which provides an economy of scale and nets overall lower transaction costs. The Eurocurrency markets are relatively cheap, short-term financing options for Eurocurrency loans; they are also a short-term investing option for entities with excess funds in the form of Eurocurrency deposits.