ON WRIT OF CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT.
White, J., delivered the opinion for a unanimous Court.
JUSTICE WHITE delivered the opinion of the Court.
Section 2 of the Sherman Act, 26 Stat. 209, as amended, 15 U.S.C. § 2, makes it an offense for any person to "monopolize, or attempt to monopolize, or combine or conspire with any other person or persons, to monopolize any part or the trade or commerce among the several States." The jury in this case returned a verdict finding that petitioners had monopolized, attempted to monopolize, and/or conspired to monopolize. The District Court entered a judgment ruling that petitioners had violated § 2, and the Court of Appeals affirmed on the ground that petitioners had attempted to monopolize. The issue we have before us is whether the District Court and the Court of Appeals correctly defined the elements of that offense.
Sorbothane is a patented elastic polymer whose shock-absorbing characteristics make it useful in a variety of medical, athletic, and equestrian products. BTR, Inc. (BTR), owns the patent rights to sorbothane, and its wholly owned subsidiaries manufacture the product in the United States and Britain. Hamilton-Kent Manufacturing Company (Hamilton-Kent) and Sorbothane, Inc. (S. I.) were at all relevant times owned by BTR. S. I. was formed in 1982 to take over Hamilton-Kent's sorbothane business.*fn1 App. to Pet. for Cert. A3. Respondents Shirley and Larry McQuillan, doing business as Sorboturf Enterprises, were regional distributors of sorbothane products from 1981 to 1983. Petitioner Spectrum Sports, Inc. (Spectrum), was also a distributor of sorbothane products. Petitioner Kenneth B. Leighton, Jr., is a co-owner of Spectrum. Ibid. Kenneth Leighton, Jr., is the son of Kenneth Leighton, Sr., the president of Hamilton-Kent and S. I. at all relevant times.
In 1980, respondents Shirley and Larry McQuillan signed a letter of intent with Hamilton-Kent, which then owned all manufacturing and distribution rights to sorbothane. The letter of intent granted the McQuillans exclusive rights to purchase sorbothane for use in equestrian products. Respondents were designing a horseshoe pad using sorbothane.
In 1981, Hamilton-Kent decided to establish five regional distributorships for sorbothane. Respondents were selected to be distributors of all sorbothane products, including medical products and shoe inserts, in the Southwest. Spectrum was selected as distributor for another region. Id., at A4-A5.
In January 1982, Hamilton-Kent shifted responsibility for selling medical products from five regional distributors to a single national distributor. In April 1982, Hamilton-Kent told respondents that it wanted them to relinquish their athletic shoe distributorship as a condition for retaining the right to develop and distribute equestrian products. As of May 1982, BTR had moved the sorbothane business from Hamilton-Kent to S. I. Id., at A6. In May, the marketing manager of S. I. again made clear that respondents had to sell their athletic distributorship to keep their equestrian distribution rights. At a meeting scheduled to discuss the sale of respondents' athletic distributorship to petitioner Leighton, Jr., Leighton, Jr., informed Shirley McQuillan that if she did not come to agreement with him she would be "'looking for work.'" Id., at A6. Respondents refused to sell and continued to distribute athletic shoe inserts.
In the fall of 1982, Leighton, Sr., informed respondents that another concern had been appointed as the national equestrian distributor, and that they were "no longer involved in equestrian products." Id., at A7. In January 1983, S. I. began marketing through a national distributor a sorbothane horseshoe pad allegedly indistinguishable from the one designed by respondents. Ibid. In August 1983, S. I. informed respondents that it would no longer accept their orders. Ibid. Spectrum thereupon became national distributor of sorbothane athletic shoe inserts. Pet. for Cert. 6. Respondents sought to obtain sorbothane from the BTR's British subsidiary, but were informed by that subsidiary that it would not sell sorbothane in the United States. Respondents' business failed. App. to Pet. for Cert. A8.
Respondents sued petitioners seeking damages for alleged violations of §§ 1 and 2 of the Sherman Act, 15 U.S.C. §§ 1 and 2*fn2, § 3 of the Clayton Act, 38 Stat. 731, 15 U.S.C. § 14, the Racketeer Influenced and Corrupt Organizations Act, 18 U.S.C. § 1962, and two provisions of California business law. Respondents also alleged fraud, breach of oral contract, interference with prospective business advantage, bad faith denial of the existence of an oral contract, and conversion.
The case was tried to a jury, which returned a verdict against one or more of the defendants on each of the 11 alleged violations on which it was to return a verdict. All of the defendants were found to have violated § 2 by, in the words of the verdict sheet, "monopolizing, attempting to monopolize, and/or conspiring to monopolize." App. 410. Petitioners were also found to have violated civil RICO and the California unfair practices law, but not § 1 of the Sherman Act. The jury awarded $1,743,000 in compensatory damages on each of the violations found to have occurred.*fn3 This amount was trebled under § 4 of the Clayton Act. The District Court also awarded nearly $1 million in attorneys' fees and denied motions for judgment notwithstanding the verdict and for a new trial.
The Court of Appeals for the Ninth Circuit affirmed the judgment in an unpublished opinion. The court expressly ruled that the trial court had properly instructed the jury on the Sherman Act claims and found that the evidence supported the liability verdicts as well as the damages awards on these claims. The court then affirmed the judgment of the District Court, finding it unnecessary to rule on challenges to other violations found by the jury. App. to Pet. for Cert. A28. On the § 2 issue that petitioners present here, the Court of Appeals, noting that the jury had found that petitioners had violated § 2 without specifying whether they had monopolized, attempted to monopolize, or conspired to monopolize, held that the verdict would stand if the evidence supported any one of the three possible violations of § 2. Id., at A15. The court went on to conclude that a case of attempted monopolization had been established.*fn4 The court rejected petitioners' argument that attempted monopolization had not been established because respondents had failed to prove that petitioners had a specific intent to monopolize a relevant market. The court also held that in order to show that respondents' attempt to monopolize was likely to succeed it was not necessary to present evidence of the relevant market or of the defendants' market power. In so doing, the Ninth Circuit relied on Lessig v. Tidewater Oil Co., 327 F.2d 459 (CA9), cert denied, 377 U.S. 993 (1964), and its progeny. App. to Pet. for Cert. A18-A19. The Court of Appeals noted that these cases, in dealing with attempt to monopolize claims, had ruled that "if evidence of unfair or predatory conduct is presented, it may satisfy both the specific intent and dangerous probability elements of the offense, without any proof of relevant market or the defendant's marketpower [sic]. " Id., at A19. If, however, there is insufficient evidence of unfair or predatory conduct, there must be a showing of "relevant market or the defendant's marketpower [sic]." Ibid. The court went on to find:
"There is sufficient evidence from which the jury could conclude that the S. I. Group and Spectrum Group engaged in unfair or predatory conduct and thus inferred that they had the specific intent and the dangerous probability of success and, therefore, McQuillan did not have to ...