Demand Elasticities in Food Consumption Systems

Demand elasticities in food consumption systems quantify how household purchases of various food items respond to changes in prices and incomes. Own-price elasticities capture the sensitivity of demand for a specific commodity to its own price, while cross-price elasticities reveal substitution or complementarity between different food goods. Expenditure elasticities measure shifts in consumption patterns as incomes rise, distinguishing staple foods from luxury items. Estimation techniques range from static functional forms to dynamic systems that incorporate habit formation and non-linear Engel curves. Empirical evidence demonstrates that elasticities vary considerably across regions, socio-economic groups and food categories, reflecting differences in culture, infrastructure and dietary norms. Understanding these variations is essential for designing targeted fiscal measures, stabilising markets and assessing welfare impacts of price shocks. Moreover, elasticities inform projections of future food demand under scenarios of urbanisation, population growth and climate-related supply disruptions, thereby guiding policy interventions to enhance food security, nutritional quality and environmental sustainability on a global scale.

Research from Nature Portfolio

Recent work has interrogated the relationship between urbanisation, income and food demand in India by harnessing large-scale household surveys alongside spatial data. Analyses show that once income and regional factors are controlled, own-price elasticities and average consumption patterns exhibit little difference between urban and rural populations for most commodities. Diet diversity is found to be driven more by infrastructure quality, market access and institutional norms than by urban population share alone. Cross-price effects highlight complex substitution patterns in staple and non-staple goods, challenging simplified narratives of urbanisation-driven dietary shifts. This multidimensional approach underscores the need to incorporate indirect socio-economic channels when modelling demand elasticities in rapidly urbanising contexts.

Demand Elasticities in Food Consumption Systems publication trend

The graph below shows the total number of articles in demand elasticities in food consumption systems across all publications each year (not limited to Nature Index journals).

Technical terms

Own-price elasticity: The percentage change in quantity demanded of a food item resulting from a one percent change in its own price.

Cross-price elasticity: The percentage change in demand for one food item in response to a one percent change in the price of another, indicating substitution or complementarity.

Expenditure elasticity: The responsiveness of food demand to changes in total food expenditure or income, distinguishing necessities from luxuries.

Almost Ideal Demand System (AIDS): A flexible econometric model that estimates budget shares and allows derivation of consistent price and expenditure elasticities.

Quadratic Almost Ideal Demand System (QUAIDS): An extension of the AIDS model incorporating quadratic terms to capture non-linear relationships between income and consumption shares.

References

1. Urbanization and food consumption in India. Scientific Reports (2020).
2. The analysis demand for animal source food in Indonesia: using Quadratic Almost Ideal Demand System. Verslas: Teorija ir Praktika (2020).
3. Impacts of Habit Formation Effect on Food Consumption and Nutrient Intake in Rural China. Nutrients (2024).
4. Income Variability, Evolving Diets, and Elasticity Estimation of Demand for Processed Foods in Nigeria. American Journal of Agricultural Economics (2020).