Bull Market is an advancing market. It is a long period of rising prices of securities, faster than their historical average., usually by 20% or more. Bull markets can happen as a result of an economic recovery, an economic boom, or investor psychology. The longest and most famous bull market is the one that began in the early 1990s in which the U.S. equity markets grew at their fastest pace ever. Bull markets generally involve heavy trading and are marked by a general upward trend in the market, independent of daily fluctuations. This market scenario is opposite to Bear market.