demand and supply forecasts of foodgrains, oilseeds ... · unit level data of the national sample...
TRANSCRIPT
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DEMAND AND SUPPLY FORECASTS OF FOODGRAINS, OILSEEDS,
HORTICULTURE AND ANIMAL PRODUCTS
PARMOD KUMAR
ADRTC, ISEC
BANGALORE
India Agricultural Outlook Forum 2018
NASC, Pusa, New Delhi.
September 10-11, 2018
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Outline
Estimation of Demand Model
complete demand system - all consumable items
The Model : Almost Ideal Demand System
Properties of Demand System
Data Base – Consumption and Prices
Assumption on Demand Projections
Estimation of Supply Model
OLS Estimates of Area, Yield, Prices and
Exports
Simultaneous Equation Model – 3
SLS
Data Base
Assumptions for supply Projections
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Basic properties of a demand model
Adding-up: Budget shares sum to one, i.e., total expenditure must be exhausted among individual commodities
Homogeneity condition: Demand functions are homogenous of degree zero in prices and income.
Symmetry condition: Slutsky’s symmetry condition implies that the compensated cross price elasticities are equal.
Negativity condition: Compensated demand curve is downward sloping or the substitution effect is always negative implying that the ‘law of demand’ holds.
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The Almost Ideal
Demand System (AIDS)
The AIDS model developed by Deaton and Muellbauer (1980) derive demand system by use of duality concepts, from a particular cost or expenditure function. The AIDS cost function is given by
Where α0 ,αi , βi and γij, are parameters, u is utility and pj’s are prices. AIDS
model satisfies the axioms of choice exactly, and does not impose additive preferences and under certain conditions, allows consistent aggregation of individual demands to market demands. By applying Shepard’s Lemma, that is, by differentiating the cost function, after appropriate substitutions, we obtain the AIDS in budget share form:
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The Model
• Where P is price index defined by
• With the above price index, the system becomes non-linear and
requires estimation of a large number of parameters that needs a
long data series on budget shares, total expenditure and prices.
Deaton and Muellbauer (1980a) used Stone Price Index to make
the system linear by substituting ln P* = Σ wk ln pk ;
• where P ~= P*;
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Parameter Restrictions
Adding up
Homogeneity Σyij = 0;
Symmetry Yij = Yji
The fourth restriction (concavity of the expenditure function) has no parametric representation.
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Demographic representation
Following Heien and Pompelli (1988), demographic effects
are incorporated in the model by allowing the intercept to be
a function of demographic variables as:
Where dj is the jth demographic variable, the examples could
be household size, region, gender, education level of
household head, etc.
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Two Stage Budgeting A two-stage
budgeting demand system: It is
supposed that the consumer allocates her total budget in
two stages.
In the first stage, the consumer determines the allocation of her
total expenditure between various commodity groupings, e.g., cereals, pulses, edible oils,
milk-meat, fruit-vegetables, other food items and non-food
items.
In the second stage, the expenditure is allocated
among different groups, e.g., wheat, rice and coarse grains
among the cereal group; fruit, vegetables and nuts
among fruit-vegetables group and so on.
LA/AIDS model used to estimate the two stage-
budgeting demand function
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Elasticity Formulation
Income elasticity:
own-price and cross-price elasticities
Where is Kronecker’s delta which is equal to unity for every s=r, and zero otherwise,
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Data Base – Consumption
All-India average monthly per capita consumer expenditure on food and non food commodities and the corresponding per capita total consumer expenditure (PCE), separately for rural and urban households.
Unit level data of the National Sample Survey Organization (NSSO) for its 43rd to 68th rounds for ‘Household Consumption Expenditure’.
The time period consists of a continuous time series beginning from 1987-88 (43rd round) up to 2011-12 (68th round)
Model estimated at the aggregate separately for the rural and urban sector.
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Data Base – Prices (Contd)
The wholesale price indices published by the OEA. The price indices for the seven broad groups of items as well as for the individual items were prepared at the base year 1993-94.
The price indices of all individual items for the whole time period (1987-88 to 2011-12) were first converted into 1993-94 prices (1993-94=100) through splicing. The individual items in the converted monthly price indices were matched with the items within each of the seven broad groups of the consumer expenditure to prepare wholesale price relatives in each group.
The monthly wholesale price relatives in each group were then averaged over the months covered by a NSS round to obtain the average price relative for that round in each group.
Using the expenditure weights for individual items in a broad group relative to the total expenditure on the broad group, separately for rural and urban areas, the price index relative for individual and broad group items were constructed for both rural and urban sectors.
The expenditure weights were worked out on the basis of estimated average consumer expenditure on individual items in each group, separately for rural and urban areas using the NSS 50th (1993-94) round consumer expenditure per capita data.
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Demand Model Estimation
The Linear Approximate/Almost Ideal Demand System Model
Non-linear seemingly unrelated regression method
Without and with imposing restriction of homogeneity, adding-up and symmetry.
The commodity combinations are:
Cereals - wheat, rice and coarse cereals;
Pulses
Edible oils
Milk - meat - milk and meat;
Fruits and vegetables - fruits, vegetables and dry-nuts;
Other food – sugar, spices, beverages and intoxicants
Non food
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Assumptions for Demand Projections
India’s decadal population growth rate - 1.97% PA (1991-2001), 1.64% PA (2001-2011), expected growth 1.32% PA in 2011-2021 and 1.13% in 2021-2031. Urban share expected to increase from 31.1% in 2011 to 39.1% in 2031.
Contribution of rural sector in total GDP expected to come down from 47% in 2011-12 to 44% in 2020-21 and 40% by 2032-33.
GDP growth up to 2032-33 – Two scenarios (i) 6 % and (ii) 8% per annum
Corresponding PCI growth would be (i) 4.87% and (ii) 6.87%.
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Demand Projections – Formula
Where Qijt is household demand for ith commodity for the jth sub group (rural or urban) during the tth time period; qij0 is the annual per capita quantity consumed of ith commodity by the jth sub group during the base year (2011-12); Pjt is the projected population of jth sub group in the year t; gjt is annual growth rate in per capita income for the jth sub group during the tth time period; and eij is the expenditure elasticity of the ith commodity for the jth sub group.
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Three Approaches for Demand Prediction
I. Short term Static Behaviour of Consumption based on base year consumption multiplied by projected population
II. The Normative Approach to estimate the demand based on the normative requirement as recommended by National Institute of Nutrition, Hyderabad
III. Behaviouristic Approach based on growth of population and changing behaviour of consumption on account of changing per capita income in a growing economy, measured in terms of consumption/expenditure elasticities
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Supply projections
Three Approaches
1. Based on Trends in Area and Yield at all India
2. Based on Trends in Area and Yield Among Major Growing States
3. Simultaneous Equations Model Forecasts
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Estimation of Supply System: Simultaneous Model
Supply response function
Area function
Yield function
Price response function
Export function
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Model Specification Area = f (Pi, Pj, Rain, Irrg, Fert, Fertp, Trend, Lagged)
Yield = f (Pi, Rain, Irrg, Fert, Fertp, Trend, Lagged)
Real dom price = f (MSP, WP, Prod, WI, PD, Trend, Lagged)
Exports = f (Pi, WP, Prod, Open, PD, WT, WI, REER, Trend, Lagged)
Where
Pi is real domestic (farm harvest) price;
Pj is real competing crop price;
Rain is rainfall - annual, monsoon or winter months as applicable in different cases;
Irrg is percentage of area under irrigation
Fert is fertilizer use in kgs per hectare;
Fertp is real fertilizer price;
MSP is real minimum support price;
WP is real world price or real unit value of exports;
WI is real world income;
PD is policy dummy;
Open is openness in terms of share of Indian exports in the world exports commodity wise;
WT is volume of world trade in a particular commodity.
REER is real effective exchange rate
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Specification of Crops (group of crops)
The specific crops are:
rice, wheat, kharif and rabi coarse cereals, kharif and rabi pulses and kharif and rabi oilseeds,
Sugarcane, cotton, jute & mesta, fruits, vegetables.
Crop sub-groups are:
Kharif Coarse Cereals: Jowar, Bajra, Ragi and Maize;
Rabi Coarse Cereals: Barley;
Kharif Pulses: Tur, Moong, Urad;
Rabi Pulses: Gram and Masoor (Lentil);
Kharif Oilseeds: Groundnut, Soyabeans, Sunflower, Sesamum, Nigerseed;
Rabi Oilseeds: Rapeseed & Mustard, Safflower and Linseed.
Fruits – all fruits and vegetables – all vegetables
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Population Decennial Growth
Decade
Decennial growth Percent _U Percent _R
1951-1961 1.98 18.0 82.0
1961-1971 2.24 19.9 80.1
1971-1981 2.23 23.1 76.9
1981-1991 2.16 25.5 74.5
1991-2001 1.97 27.8 72.2
2001-2011 1.64 31.1 68.9
2011-2021 1.32 34.9 65.1
2021-2031 1.13 39.1 60.9
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Predicted Population by 2031
Year Total Urban Rural % Urban UN
Projections
2011-12 1214.8 379.4 835.4 31.23 1247.2
2016-17 1297.0 428.7 868.3 33.05 1324.2
2021-22 1384.1 484.1 900.0 34.97 1397.4
2025-26 1447.9 529.8 918.0 36.59 1451.8
2031-32 1549.0 606.7 942.3 39.17 1524.1
2032-33 1566.5 620.5 946.0 39.61 1534.9
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Expenditure elasticity
Commodity Rural Urban
Cereals -0.13 -0.04
Pulses 0.55 0.36
Edible oils 0.88 0.37
Milk 0.82 0.40
Meat 0.82 0.40
Fruits, Vegetables & Nuts 0.85 0.42
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Per capita per month consumption during 2011-12 (68th Round)
Commodity Rural Urban
Rice and its products (kg) 6.13 4.66
Wheat and its products (kg) 4.43 4.32
Coarse cereals (kg) 0.69 0.33
All cereals (kg) 11.25 9.31
All pulses and products (kg) 0.79 0.90
All edible oils (kg) 0.68 0.85
Sugar (kg) 0.78 0.86
Liquid milk (litter) 4.33 5.42
Milk and products (kg) 4.38 5.55
Eggs, meat and fish (kg) 0.64 0.80
Vegetables (kg) 6.96 7.12
Fruits (kg) 1.53 2.36
Dry nuts (kg) 0.09 0.16
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Estimation of SFW and Other uses – Residual Approach
Growth rate in gap between supply and demand in (1990 to 2014)
Rice = 1.3 percent per annum
Wheat = 2.9 percent per annum
Coarse Cereals = 3.5 percent per annum
Pulses = 0.9 percent per annum
Total Foodgrains = 2.5 percent per annum.
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Average demand for SFW and other uses (million tones)
Period Rice Wheat CC Pulses Food
grains
Oilseeds (exd
oil palm)
2011-15 15.12 22.45 29.06 9.36 75.99 3.32
2031-34 20.22 34.58 54.28 12.45 121.54 16.63
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Foodgrains use as SFWI to increase from 34 million tonnes in
the early 1990s to around 76 million tonnes up to 2015-16.
It is expected to cross 95 million tones by the end of 2025-26
and above 120 million tones by 2032-33.
The ratio of SFW to total foodgrains’ demand would increase
from less than 25 percent in TE 2012-13 to around 40 percent
by 2032-33.
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Net balances of supply and demand of food grains by 2032-33
Demand Estimates – Actual Consumption :– 334-349 Million Tonnes
Calorie Based :– 356-372 Million Tonnes (sedentary)
Behaviouristic :– 326-339 Million Tonnes
Supply Estimates - All India Trends :- 405-415 Million Tonnes
State Trends :– 378-397 Million Tonnes
3SLS Model :– 343-379 Million Tonnes
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Final Estimates - Demand
Commodity 2011-12 2016-17 2020-21 2028-29 2032-33
Rice 93.99 103.59 108.16 116.49 120.84
Wheat 90.01 90.18 95.71 107.08 113.46
C. Cereals 38.00 40.02 45.44 58.98 67.48
Cereals 221.99 233.79 249.31 282.55 301.78
Pulses 20.31 23.61 26.05 31.83 35.23
Foodgrains 242.30 257.39 275.36 314.37 337.01
Edible oil (without
palmoil)
9.55 14.08 16.50 23.24 27.88
Oilseeds 34.11 50.30 58.92 83.02 99.59
Milk and products 119.38 147.54 174.26 245.61 292.15
Eggs, meat and fish 11.64 14.40 17.63 27.73 35.52
Vegetables 152.14 182.35 214.82 302.93 360.77
Fruits 88.13 101.51 121.38 171.20 203.55
Nuts 1.64 2.00 2.35 3.31 3.94
Sugar 34.74 36.53 39.66 44.25 46.37 27
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Final Estimates - Supply
Commodity 2016-17 2017-18 2020-21 2028-29 2032-33
Rice 110.15 112.50 119.76 140.25 151.69
Wheat 98.38 100.21 107.18 127.21 138.82
C. Cereals 44.19 44.09 46.96 55.93 61.79
Pulses 22.95 22.09 23.73 29.79 33.95
Foodgrains 275.67 278.88 297.63 353.17 386.25
Oilseeds 32.10 34.03 37.81 51.00 59.96
Sugarcane 306.72 333.76 353.67 407.25 435.69
Sugar 31.29 34.04 36.07 41.54 44.44
Cotton 33.09 36.75 45.71 83.43 113.94
Jute & mesta 10.60 10.69 10.99 11.88 12.39
Fruit 93.71 100.15 115.25 167.83 202.66
Vegetables 176.18 184.63 211.29 302.95 362.86
Total horti 299.85 314.98 365.10 541.42 659.38
Milk 162.53 169.88 193.97 276.28 329.73
Eggs 87.73 92.81 109.88 172.38 215.91
Wool 48.30 48.40 48.72 49.69 50.23
Meat 7.78 8.65 11.88 27.71 42.33
Fish 11.42 11.94 13.68 19.64 23.55 28
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Indirect Demand as % of Total Demand
Commodity 2011-12 2016-17 2020-21 2028-29 2032-33
Rice 12.7 11.6 11.8 12.3 12.5
Wheat 29.7 27.2 28.8 32.4 34.2
CC 76.8 79.7 82.2 86.7 88.5
Cereals 30.2 29.8 31.8 36.2 38.5
Pulses 36.2 37.5 35.8 32.6 31.0
Foodgrains 30.6 30.4 32.0 35.5 37.3
Edible oil 37.9 48.1 50.9 55.8 58.2
Milk 42.1 43.2 43.7 44.2 44.3
Meat 13.1 15.0 18.7 27.7 33.0
Veg 32.8 31.8 31.9 31.6 31.4
Fruits 70.4 68.8 69.3 69.3 69.3
Sugar 66.3 65.7 66.6 67.1 67.1
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Both demand and supply estimates were worked out using three different methods that provide us all the possible ranges for the forecast period.
Whereas the static approach demand estimates arrive at 334-350 million tonnes of foodgrains demand during 2032-33, the behaviouristic approach provide us the range of 326-340 million tonnes.
Similarly, the supply estimates based on all India and state trends work out around 378-415 million tonnes of foodgrains production while 3 SLS model provide the range of 343 to 380 million tonnes.
The balance sheet looks quite affirmative for foodgrains except the case of pulses and oilseeds in which case India is already in acute deficit.
India is poised for some surplus in rice and wheat while coarse grains will be sufficient to meet the domestic demand whereas pulses will have deficit of around 5 to 7 million tonnes.
The overall foodgrains will have quite comfortable position as far as food security is concerned.
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In oilseeds a massive deficit of more than 50 million tonnes will appear which was worked out without including the imported palm oil whose import already exceeded 9 million tonnes in 2014-15.
Unless India succeeds in achieving nothing less than second Yellow Revolution either through technological breakthrough somewhat similar to BT Cotton, or there is massive expansion in area under oilseeds along with transformation achieved in the yield rate.
There is huge possibility of expanding area under oil palm which has much better yield rate compared to oilseed field crops.
In other commodities including milk, meat, fruits and vegetables and sugar there appears to be fine balance between demand and supply given the assumptions on supply side turns true.
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Thank You All
Comments & Suggestions
Most Welcome