Stock Market Performance. Stock Market Performance is the indicator of the stock market as a whole or of a specific stock. It gives signal to the investors about their future moves. The movement in the price of a stock and the indexes gives the idea of the near future trend of the stock, sector or the economy as a whole. As financial domain is the most important one of an economy, so the stock market performance works as an indicator of the overall health of the economy. Stock Market Indexes typically gives the overall performance of the market or of a specific sector. Indexes reflect the performance of the economy or a sector in entirety. Stock Prices are an indicator of the performance of the stock.