American Key Corporation, and Ron Deweese v. Cole National Corporation, and Sears, Roebuck and Co.

How courts have described this case

Verbatim parenthetical descriptions written by other courts when citing this decision. Ranked by citation-network relevance.

• “Expert opinions ordinarily cannot be based upon the opinions of others whether those opinions are in evidence or not”
• “Construction of a relevant economic market ... cannot ... be based upon lay opinion testimony.”
• “Construction of a relevant economic market or a showing of monopoly power in that market cannot ... be based upon lay opinion testimony.”
• “The relevant market is the ‘area of effective competition’ in which competitors generally are willing to compete for the consumer potential, and not the market area of a single company.”
• “The relevant market is the ‘area of effective competition’ in which competitors generally are willing to com pete for the consumer potential, and not the market area of a single company.”
• “An expert witness’s opinion testimony does not have to be based upon admissible evidence.”

Source: CourtListener parenthetical corpus (CC0).