Answer:
The market basket approach is intended to isolate changes in price level by holding constant the quantity of goods and services purchased in two or more periods of interest.
The Market Basket Approach is a method of measuring price changes in the Economy and is usually used to track changes in an individual market segment. It works by constantly buying a certain amount of goods and services overtime. The changes in price for those exact same goods will give an indication of just how much price is changing by in the Economy.
The Consumer Price Index (CPI) is a type of CPI.