Substitution Effect
The tendency of consumers to switch from a product that has become more expensive to a cheaper alternative that serves a similar purpose.
How It Works
The substitution effect is a fundamental concept in consumer economics and plays a major role in food purchasing decisions. When the price of ground beef rises sharply, consumers may substitute ground turkey, chicken, or plant-based alternatives. When lettuce prices spike due to a crop failure in California, consumers switch to cabbage, spinach, or other greens. The BLS actually accounts for substitution in two ways: the CPI-U uses a modified Laspeyres formula that tends to overstate inflation because it does not account for substitution, while the Chained CPI (C-CPI-U) uses a superlative formula that captures substitution and typically runs 0.2-0.3 percentage points lower. In food specifically, the substitution effect is strong because many items are close substitutes, ground chuck for ground round, cheddar for American, Roma tomatoes for beefsteak. Burgernomics holds the recipe fixed and does not allow substitution, which makes it a purer cost tracker but also means it may overstate the practical cost increase consumers experience.
Related Terms
- Food Price Elasticity, A measure of how much consumer demand for a food product changes in response to a change in its price, inelastic items (like ground beef) see little demand change, while elastic items see large shifts.
- Consumer Price Index (CPI), A measure of the average change in prices paid by urban consumers for a fixed basket of goods and services, published monthly by the Bureau of Labor Statistics.
- Basket of Goods, A fixed set of consumer products and services used to measure price changes over time, the CPI basket contains about 80,000 items, while the Burgernomics uses a basket of 5 burger ingredients.
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About This Definition
This definition is part of the Burgernomics Food Economics Glossary, 25 terms explaining food pricing, inflation, and economic concepts. Written for consumers, journalists, students, and anyone who wants to understand why their groceries cost what they do.