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What is the significance of wholesale and retail inflation rates diverging

The WPI inflation for October has touched a 40-month low. But retail inflation in the country for the same month has touched a 16-month high.

Written by Udit Misra | New Delhi |
Updated: November 16, 2019 9:46:41 am
wholesale inflation india, retail inflation october, Economic slowdown India, WPI October, WPI india, indian express, express explained This deceleration in wholesale prices has happened despite a significant jump in wholesale food prices.

On Thursday, the official data showed that the wholesale inflation in the country for October grew by just 0.16 per cent. In October last year, it grew by 5.5 per cent. As the chart alongside shows, the rate of wholesale inflation has been falling steadily.

(Source: CARE rating)

This deceleration in wholesale prices has happened despite a significant jump in wholesale food prices.

WPI food inflation rose to 7.6 per cent. The spike was essentially led by an almost 40 per cent surge in vegetable prices and a 17 per cent surge in the price of pulses. Increases in prices of spices and cereals, too, contributed to increasing wholesale food inflation.

But what continued to pull down overall wholesale inflation number was the continued “deflation” (that is, prices falling from one month to the next) in manufactured goods.

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How does the wholesale inflation trend compare with retail inflation trend?

The WPI inflation for October has touched a 40-month low. But retail inflation in the country for the same month — data released on Wednesday — has touched a 16-month high.

This essentially means that while prices are falling or growing at a marginal rate at the wholesale level, the trend reverses at the retail consumer level, where prices are growing at a faster clip every successive month.

Why does this happen?

At one level, it makes no sense why prices would fall or grow at a marginal level at the wholesale level while rising at the retail level.

But one must consider a couple of issues.

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One is the way this information is reaching us — that is, the WPI and CPI indices. In other words, some part of the difference between the wholesale and retail inflation trends is explained by the way these indices are made.

For instance, food articles have a much higher weight — over 45 per cent — in CPI or retail inflation index. In WPI, their weight is less than 30 per cent. So even a similar spike in prices will show up a much higher impact in the retail inflation index than the wholesale inflation index.

Similarly, fuel and energy have a much higher weight in WPI inflation.

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Then there are other items such as “services” which have a weight of about 30 per cent that can only be found in retail inflation. A spike in these prices obviously bumps up only the retail inflation while leaving the wholesale inflation unaffected.

Has this happened before?

Yes, it has. Between 2012 to 2015 there was a growing divergence between retail and wholesale inflation indices. By October 2015, wholesale inflation was negative — that is, actual prices were declining — while retail inflation was over 7 per cent. While raging food inflation was a contributor, the spike in services such as education and medical facilities was the biggest reason for this divergence in 2015.

How does this impact policymaking?

To some extent, the difference between CPI and WPI inflation is not only understandable but also reasonable. After all, the two indices have been made to better under how prices behave between the wholesale and retail levels.

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However, a growing divergence between the two creates a serious worry for all policymakers concerned. None more so than the central bankers.

If the RBI looks at retail inflation, which is at 4.6 per cent and is expected to stay above the 4 per cent mark till March 2020, it would be expected to raise interest rates and bring down inflation.


But if it were to look at WPI, the policy advice would be completely different. The RBI would then be expected to cut rates further and quite sharply to raise inflation. That’s because such a low inflation rate — as the WPI is showing at present — is essentially a reflection of a weakening economy.

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First published on: 15-11-2019 at 05:03:53 pm
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