An economic indicator is a statistic about an economic activity. Economic indicators allow analysis of economic performance and predictions of future performance. One application of economic indicators is the study of business cycles. Economic indicators include various indices, earnings reports, and economic summaries: for example, the unemployment rate, quits rate (quit rate in American English), housing starts, consumer price index (a measure for inflation), consumer leverage ratio, industrial production, bankruptcies, gross domestic product, broadband internet penetration, retail sales, stock market prices, and money supply changes.