Short-Term and Medium-Term Welfare Effects of Higher Food Prices
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What is the effect of a price change on households before they have a chance to respond to the new prices?
Short-run Net Benefit Ratio Analysis
Uses household survey data to estimate the short-run impact of a price change on the welfare of different types of households.
- Nationally representative household survey data that includes the value of purchases and sales of the commodity and total income or consumption expenditure.
- Estimate of percentage change in commodity price
|Δ y/y||proportional change in household welfare (usually expressed in terms of the value of household consumption)|
|fi||share of income from the sale of i|
|si||share of expenditure going to the purchase of i|
|Δ pi / pi||proportion change in the price of i|
|( fi – si )||net benefit ratio, the ratio of net sales of i divided by household income or expenditure|
Estimates of the short-term percentage change in welfare for different types of households as a result of the price change. Can be considered the short-term elasticity of welfare with respect to price of a commodity.