Index of Industrial Production (Detailed)
The Index of Industrial Production (IIP) is a monthly statistical measure compiled by the Ministry of Statistics and Programme Implementation (MoSPI) that tracks the quantum of output across manufacturing, mining, and electricity sectors relative to a base year, providing a timely gauge of industrial activity.
India's IIP uses 2011-12 as its base year (rebased in 2017) and covers 407 item groups across three broad sectors: Manufacturing (with a weight of 77.63%), Mining (14.37%), and Electricity (7.99%). Data is released by MoSPI with a 6-week lag—for example, December IIP is typically released in mid-February. This lag is partially compensated for by core sector data, which is released earlier and covers 40.27% of the IIP.
Within manufacturing, the IIP provides a use-based classification that is analytically powerful: Primary Goods, Capital Goods, Intermediate Goods, Infrastructure & Construction Goods, Consumer Durables, and Consumer Non-Durables. Capital goods production is the most volatile category and is watched as a proxy for private sector investment activity. Sustained growth in capital goods output suggests that businesses are expanding capacity, which is a lead indicator of future economic momentum. Consumer Durables growth tracks discretionary household spending, while Consumer Non-Durables reflects essential consumption.
IIP data undergoes two revisions: a quick estimate is released first, followed by a revised estimate one month later, and a final estimate the month after that. Significant revisions are common, particularly for capital goods, and historical data can change materially. Analysts therefore focus on trends rather than point estimates and are wary of over-interpreting a single month's number.
The IIP has structural limitations. It does not capture the services sector, which accounts for over 50% of India's GDP. The coverage of the informal manufacturing sector is partial. Furthermore, the index measures volume of output, not value—meaning that price movements in raw materials do not affect the index directly, but input cost pressures can cause production cutbacks that do show up as output declines.
For equity markets, IIP is a macro input rather than a direct stock-level driver. Nevertheless, capital goods IIP growth above 10% for several consecutive months has historically coincided with strong performance in engineering and industrial stocks, as it signals healthy order execution and capacity utilisation.