The index of prices of a given basket of commodities which are bought by the representative consumer is known as:

Consumer Price Index

The correct answer is Option (1) → Consumer Price Index

Consumer Price Index (CPI): This is the index of prices of a given basket of commodities which are bought by the representative consumer. CPI is generally expressed in percentage terms. We have two years under consideration – one is the base year, the other is the current year. We calculate the cost of purchase of a given basket of commodities in the base year. We also calculate the cost of purchase of the same basket in the current year. Then we express the latter as a percentage of the former. This gives us the Consumer Price Index of the current year vis-´a-vis the base year.