EXPLAINING INFLATION IN INDIA:
† THE ROLE OF FOOD PRICES
Prachi Mishra Research Department, International Monetary Fund‡
Devesh Roy International Food Policy Research Institute
October 31, 2011
Abstract This paper conducts a forensic examination of inflation in India with a focus on food price inflation, using a disaggregated high-frequency commodity level dataset spanning the last two decades. First, we document stylized facts about the behavior of overall inflation in India. We establish that low inflation has historically been a rare occurrence in the Indian economy in the last two decades; the long-term trend in the inflation rate exhibits a U-shaped pattern with a structural break in the trend in 2000 and an inflection point in 2002. The long-term trend in food inflation has followed a pattern similar to overall inflation. Domestic and international food price inflation rates have been moderately correlated, though there is significant variation across commodities based on their tradability. Furthermore, we find food price inflation to be consistently higher than non-food, quite persistent, and having a significant pass-through to non-food inflation. Further, the price of food relative to non-food co-moves strongly with aggregate inflation rate.
Next, we explicitly quantify the contribution of specific commodities to food price inflation. We find that animal source foods (milk, fish), processed food (sugar, edible oils), fruits and vegetables (e.g. onions) and cereals (rice and wheat) are the primary drivers of food price inflation. Finally, we conduct case studies of some of the top contributors to food price inflation. Combining the insights from macro as well as micro analyses, the paper suggests specific policy implications.
JEL Classification Numbers: E31, Q18 Keywords: Food, Inflation
† We are especially grateful to Arvind Panagariya for extensive comments and Larry Ball for many discussions. We would also like to thank Andy Berg, Olivier Blanchard, Jordi Gali, Peter Pedroni, T.N. Srnivasan, Kanhaiya Singh, and participants at the India Policy Forum, and the Reserve Bank of India for helpful comments. Enrico Berkes and Manzoor Gill provided excellent research assistance. Contact information: Prachi Mishra, 700 19th St NW, Washington, DC 20431, 202-623-9409, [email protected]; Devesh Roy, 2033 K Street NW, Washington DC, 20006, 202-862-5691, [email protected] ‡ The views expressed here are those of the authors and do not necessarily represent those of the IMF/IFPRI or IMF/IFPRI policy.
2
I. INTRODUCTION
While inflationary policies can provide a short-run stimulus to the economy, the literature suggests that, over the medium and long term, high rates of inflation are not conducive to economic growth. In a seminal paper, Fischer (1993) presents cross-country evidence to show that growth is negatively associated with inflation, and the causality runs from inflation to growth. The mechanisms through which high inflation can reduce growth are through declines in investment and productivity growth. He also presents few exceptional cases to show that low inflation ( <15 percent) is not necessary for high growth, but that high inflation ( >50 percent) is not consistent with sustained growth. Overall, he concludes based on the regression evidence and case studies that low inflation is conducive to sustained growth.1
Furthermore, it is often claimed that the costs of inflation are likely to be borne most
heavily by the poor. The underlying argument is that the poor are typically wage earners, and
their incomes change slowly. As argued in Fischer and Modigliani (1978), “it has typically been
believed that wages lag behind inflation, and that inflation therefore implies a shift away from wage earners, and towards profits”. In addition, the rich have assets that are more likely to be indexed to inflation. According to Easterly and Fischer (2001), “a growing body of literature on balance—but not unanimously—tends to support the view that inflation is a cruel tax”. They present cross-country evidence to show that improvements in the poor’s share of national income, the percentage decline in poverty and the percentage change in the real minimum wage
1 There is a vast literature which suggests that the relationship between inflation and growth tends to be non-linear. However, there is significant debate about the cutoff point beyond which inflation becomes detrimental to growth. For example, Bruno and Easterly (1995) suggest 40 percent as a danger point, beyond which increases in inflation are very likely to lead to a growth crisis. In contrast, Khan and Senhadji (2000) estimate that the threshold above which inflation significantly slows growth is 1-3 percent for industrial countries and 7-11 percent for developing countries.
3
are all negatively correlated with the rate of inflation. In the case of India, Datt and Ravallion
(1996) use data across states and over time to show that higher inflation is associated with higher
poverty rates.
Both from the perspective of its effect on growth and its impact on the poor, inflation
remains a top concern in India. The current Prime Minister of India noted recently that “inflation
poses a serious threat to the growth momentum. Whatever be the cause, the fact remains that
inflation is something which needs to be tackled with great urgency.” In terms of the recent trend
in inflation, India does stand out among the emerging economies. The Consumer Price Index
(CPI) inflation rate reached 12 percent in 2010, a much higher level than the group of other
emerging economies commonly known as BRICS (Brazil, Russia, India, China, and South
Africa) (Figure 1). Based on the officially reported CPI figures, the inflation rate in India in 2010
was close to thrice that in China and South Africa, and roughly twice the levels in Brazil and
Russia. Moreover, the trend in the inflation rate in India is striking. While the other BRICS show more or less a declining trend during the last decade, India has had a steady upward trend.
Given the recent episodes of high inflation, it is important to investigate its primary
drivers, e.g. food, non-food, etc. From a policy perspective, to tackle inflation, it may, however
not be sufficient to identify the sources only at a broad level, particularly in the context of a
developing county like India. In India, both macro policies like monetary tightening by the
Reserve Bank of India (RBI) as well as commodity-specific measures by different branches of
the government ((e.g. trade policies and domestic interventions) have been used to deal with
inflation. Therefore, combining the perspectives from both macro as well as micro data may be
crucial to get a better diagnosis and to design policies to rein in inflation. In particular,
understanding the heterogeneities across commodities could be important to inform macro
4
policy. For example, the assumption in standard macro models that changes in relative price of
food and fuel represent supply shocks may not hold for many commodities. Furthermore, given
that there has been a persistent upward trend in inflation, taking a long-term view rather than
focusing only on the recent inflation episodes seems imperative.
To our knowledge, there is little systematic empirical evidence on the long-term
evolution of inflation in India at a disaggregated level. The goal of this paper is to fill this gap in
the literature.
Specifically, this paper focuses on food prices. Studying food prices may be particularly
important for various reasons. As argued by Cecchetti (2007), ignoring food and energy prices
particularly in recent times when they have consistently been rising faster than other prices,
could lead to biased estimates of medium-term inflation.
In the case of India with a large share of population that is poor (42 percent in 2005,
based on Chen and Ravallion, 2008), food price inflation can be particularly important. This is
because poor spend a large proportion of their income on food (over 50 percent based on 2004-
05 round of the National Sample Survey (NSS)), are typically net buyers of food and have
incomes that tend to be fixed.2
The rest of the paper is organized as follows. Section II discusses the measurement of
inflation in India, and Section III discusses the trends in overall inflation. Section IV establishes
the importance of food, Section V identifies the sources of food price inflation at the commodity
level and Section VI presents case studies of specific commodities. Section VII concludes and
presents some policy implications.
2Panagariya (2005) argues more generally that an increase in food prices due to removal of OECD subsidies might actually hurt the poor in developing countries, many of who tend to be net buyers. Specifically in the Indian case, de Janvry and Sadoulet (2008) estimate a large share of the rural population to be net food buyers.
5
II. MEASUREMENT OF INFLATION IN INDIA
Price Indices and Inflation
The official price indices in India are calculated using the Laspeyres formula. Formally,
the index is calculated as,