An informal term referring to the
deregulation of the London Stock Market on October 27, 1986. On that date, a number of changes occurred, including a shift from an
open outcry system to an electronic exchange. Perhaps most important, however, was the abolition of fixed
commissions, which completely changed the way
brokers on the London Stock Market conducted their business. Big Bang significantly increased the
volume on the London Stock Exchange and reversed its
trend of falling behind other world
stock markets. It was a major part of Prime Minister Margaret Thatcher's
financial reform program.
It is important to note that one does not refer to Big Bang as the Big Bang.