United States v. E. I. Du Pont De Nemours & Co.
Headline: Court treats cellophane as part of the wider flexible packaging market, upholding du Pont’s victory and making it harder to prove a single-product monopolization claim against the company.
Holding: The Court held that du Pont did not monopolize cellophane because cellophane was part of a broader flexible packaging market whose competing materials prevented du Pont from controlling price or excluding rivals.
- Makes it harder to prove single-product monopolies when substitutes exist.
- Limits government success in monopolization cases focused only on product share.
- Affects how regulators define markets in antitrust investigations.
Summary
Background
The United States sued a large chemical company, alleging it had illegally monopolized the cellophane market and asking for court orders to break up or limit its control. The trial took place after a 1947 complaint; the judge found for the company. Du Pont made about 75% of the cellophane sold, but cellophane was less than 20% of all flexible packaging materials, a fact the court relied on. The government appealed only the claim that du Pont monopolized cellophane.
Reasoning
The key question was whether the market to be measured was cellophane alone or the larger group of flexible packaging materials. The Court agreed with the trial judge that buyers treated many wrappings as reasonable substitutes for similar uses, so competition from glassine, waxed paper, foil and various films limited du Pont’s power to set prices or exclude rivals. The Court emphasized practical interchangeability, price sensitivity, and uses across industries, and held that the government failed to prove unlawful monopoly power over the relevant market.
Real world impact
The decision means it is harder for the government to win a monopolization case by pointing only to a high share of one branded or single-product line when many alternative materials serve the same packaging uses. The ruling is based on the trial court’s factual findings, so it rests on the evidence about how buyers and sellers actually behaved in the market. The Court affirmed the lower-court judgment for du Pont.
Dissents or concurrances
One Justice concurred with the market ruling. A dissent argued that cellophane was a distinct market, that du Pont’s agreements and pricing showed monopoly power, and that the case should have been sent back for relief against du Pont.
Opinions in this case:
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