Although currencies can be supported by various means for short periods, the primary determinant of exchange, rates is the supply of and demand for the various currencies. Under current international agreements, exchange rates are allowed to "float_" During periods of extreme fluctuations, however, governments and control banks may intervene to maintain stability in the market.

Leased telephone circuits represent a direct exposure to the risk of breached
data integrity.
They use public lines that c. an be easily identified and tapped.

An American option is a contractual arrangement that gives the owner the right to buy or sell an asset at a fixed price at any moment in time before or on a specified date.