1. Producer Price Index (PPI) - Better measure of inflation compared to WPI and CPI: Correct. PPI is considered a better measure of inflation as it reflects the prices received by producers for their goods and services, providing a more accurate picture of inflation.
2. Housing Price Index (HPI) - Covers 50 cities including 18 State/UT capitals: Correct. The NHB Residex covers 50 cities, including 18 State/UT capitals and 37 Smart Cities, and is published quarterly with 2012-13 as the base year.
3. Service Price Index (SPI) - Measures price changes in the services sector: Incorrect. There is no current index to measure the price changes in the services sector in India despite the growing contribution of the tertiary sector to GDP.
4. Depression - Characterized by extremely high aggregate demand: Incorrect. A depression is characterized by extremely low aggregate demand, which leads to deceleration of economic activities, lower inflation, shrinking employment opportunities, and forced labor cuts.
Thus, only two pairs are correctly matched.