Economic indicators provide information about economic performance and allow analysis of business cycles. Some key economic indicators mentioned in the document include GDP, fiscal deficit, Sensex stock index, CPI inflation index, HDI human development index, and balance of payments. GDP measures total economic output, fiscal deficit is the gap between government spending and revenues, Sensex tracks the Bombay stock exchange, CPI measures inflation, HDI assesses health, education and income, and balance of payments tracks international monetary transactions.