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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →In introductory economics, a product market is the setting in which firms sell final goods and services to buyers, including households. It is contrasted with the factor market, where firms buy the inputs they need to make those goods, such as labor and capital. In competition law and antitrust analysis, the term has a narrower meaning: the product dimension of a relevant market, which asks which products actually constrain one another. The two uses share a name but answer different questions, so this article treats them separately.
The classroom meaning: product markets and factor markets
Basic microeconomics models the economy as two linked sets of exchanges. Households supply labor and capital to firms in factor markets and receive wages, rent and interest. Firms then sell goods and services in product markets and receive revenue. The same firm appears on both sides: its labor costs are a factor-market matter, while its selling prices are a product-market matter.
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| Feature | Product market | Factor market |
|---|---|---|
| What is traded | Final goods and services | Inputs used to produce them, such as labor, land and capital |
| Typical seller | Firms | Households (for labor and capital services) |
| Typical buyer | Households and other buyers | Firms |
| Price concept | The price of the good or service | Wage (labor), rent (land), or interest or return (capital) |
| Illustrative example (not drawn from a specific market) | A household buys bread at a supermarket | A bakery hires a baker at an hourly wage |
This classroom split is the level at which most economics courses introduce the idea. It describes where prices for finished goods and for inputs are formed, but it does not tell you how to decide which products belong together in a specific market.
The competition-law meaning: the product dimension of a relevant market
Antitrust agencies need a defined “relevant market” to measure market shares and concentration and to assess whether a merger or a business practice could harm competition. The 2023 Merger Guidelines, issued jointly by the U.S. Department of Justice and the Federal Trade Commission, state the basic building block in section 4.3:
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“A relevant antitrust market is an area of effective competition, comprising both product (or service) and geographic elements.”
A product market in this sense is therefore only half of the answer. The other half is geography: the area within which buyers can practically turn to alternatives. A product boundary that is sensible in one region may be too wide or too narrow in another.
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How analysts draw product boundaries
Product boundaries are set by evidence about buyer behavior, not by product labels. A typical sequence looks like this:
- Start with the candidate product and its use. Identify what the buyer is trying to accomplish and which products are offered for that purpose.
- Compare characteristics, prices, intended use and quality. Ask whether buyers regard the alternatives as interchangeable or substitutable.
- Test switching. Ask whether enough buyers would move to another product after a price increase or other worsening of terms. If they would, the alternative is inside the market. If they would not, the boundary is tighter.
- Add the geographic test. Determine the area in which buyers can practically switch, such as a town, a region or a national market.
- Check supplier responses where the framework allows. Some jurisdictions include whether suppliers could shift production quickly and at little cost. Others treat that question elsewhere in the analysis (see the comparison below).
- Accept overlapping answers. The result is an analytical boundary supported by evidence, and more than one overlapping market can be relevant.
Demand substitution and supplier responses
The 2023 U.S. guidance frames the product test in demand-side terms:
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“Market definition focuses solely on demand substitution factors, that is, on customers’ ability and willingness to substitute away from one product or location to another in response to a price increase or other worsening of terms.”
Other frameworks treat supplier behavior differently, so the same product can be bounded in slightly different ways depending on where the case is heard.
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| Framework | Basis for the product boundary | Treatment of supplier responses |
|---|---|---|
| 2023 U.S. Merger Guidelines (DOJ and FTC) | Customers’ ability and willingness to switch after a price increase or other worsening of terms | Market definition uses demand substitution only; supplier responses are considered in other parts of the competition analysis |
| European Commission decision practice | Products regarded by consumers as interchangeable or substitutable, given their characteristics, prices and intended use | Supply substitution is considered where a supplier could switch production effectively and immediately, without significant additional cost or risk |
| Canadian Competition Bureau guidance | Buyers’ ability or willingness to switch, supported by evidence on demand elasticity | Not stated in the guidance reviewed for this article |
A worked example (illustrative)
Consider a shopper who buys whole-bean coffee for an espresso machine. This is a hypothetical case, not a finding about any real market. The analyst would ask whether enough buyers like this one would switch to instant coffee after a price increase. Because the taste and preparation differ, instant coffee may sit outside the product market for this group, even though both are sold as “coffee.” Pre-ground coffee or capsules made for the same machine may be closer substitutes and therefore inside the boundary. The geographic step then asks whether the shopper can practically buy from distant online sellers, which could widen the geographic market beyond a single town.
Common mistakes to avoid
- Treating the product label as the market. Two products with the same name may not be substitutes for the same buyers, and two differently named products may be.
- Assuming there is only one correct market. Boundaries involve judgment about size, quality, customer segment and price, and several overlapping markets can be relevant.
- Mixing the two meanings. A product market in a textbook diagram is not the same as a product dimension in a merger review, even though both involve sellers and buyers.
- Applying one jurisdiction’s method everywhere. The U.S., EU and Canadian frameworks differ on supplier responses, so a conclusion in one may not carry over to another.
Jurisdiction, dates and further reading
The U.S. approach described here comes from the 2023 Merger Guidelines. The European Commission and Canadian Competition Bureau materials cited in this article show other formulations. None of these is a universal law of economics; each is a method used by a particular enforcement body. Agencies revise their guidance, so confirm the current version before relying on any of them in a legal, filing or compliance setting.
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For the introductory framing of product and factor markets, MIT OpenCourseWare publishes course materials for its Principles of Microeconomics course that cover the classroom model described above.
Frequently Asked Questions
Is a product market the same as an industry?
Not exactly. An industry is usually a broader grouping of firms with related activity, often organized by production method or statistical classification. A product market is defined by which products buyers treat as substitutes, so it can be narrower or wider than an industry.
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