What is the sharpe index?

Stock market indices may be classed in many ways. A broad-base index represents the performance of a whole stock market— and by proxy, reflects investor sentiment on the state of the economy. The most regularly quoted market indices are broad-base indices including the largest listed companies on a nation's largest stock exchange, such as the American Dow Jones Industrial Average and S&P 500 Index, the British FTSE 100, the French CAC 40, the German DAX and the Japanese Nikkei 225.