# Correlation between CPI and GDP

What is the relationship between GDP and CPI(consumer price index)? My thinking is that if the CPI increases, this means that the market basket cost has increased, therefore, the consumer spending has increased. If the consumer spending increases, then GDP increases. However, depending on the consumer preferences, CPI can either underestimate or overestimate the cost of living. So from here, I cannot draw consequences about how CPI affects GDP or vice versa. Can someone please explain this? Is my thinking correct? Can there be any additions to these?

Any help would be appreciated!

• GDP in nominal or in real terms? Feb 27, 2015 at 0:58
• thoughts on both terms would be appreciated @AlecosPapadopoulos Feb 27, 2015 at 3:00
• Are you aware about the differences between CPI and GDP-deflator? Feb 27, 2015 at 3:04
• No I dont know that. I know what GDP deflator is tho Feb 27, 2015 at 13:05
• Feb 12, 2016 at 17:35

http://econsmalaysia.blogspot.my/2013/05/gdp-deflator-inflation-consumer.html. Here read this. Its almost a non-related type of measurement

From the article:

The differences in calculation are quite substantial and meaningful – they’re not looking at the same thing. In fact, calculating the GDP deflator is fairly convoluted as these things go – first tabulate all goods and services in current prices, then measure the same goods and services in prices prevailing in the base year, then calculate the ratio of current price production to constant price production. This ratio (multiplied by 100) is the GDP Deflator index, from which growth rates (inflation) can be calculated.

The CPI on the other hand, is based on changes in prices only, as the volume of goods consumed by a “representative” (average) household is taken to be fixed. The index is just a weighted average of the changes in prices across the same basket of goods.

As an example, below are the GDP deflator and CPI for Malaysia, which show weak correlation

The key thing to understand is that while both can be affected by broad macro policy (like loose money), they do not neccessarily always drive each other, as the GDP deflator could be driven by a surge in export commodity pricing that is largely captured by foreign firms with little corresponding increase in pay to local workers and consequently little increase in CPI.

The relationship would have to be examined in terms of a single economy because the weight of outside factors confounds the relationship between the CPI and GDP