We consider an issue near and dear to almost every lawyer’s heart — legal fees.

I

Casares and Schultz were investors in a private placement of stock in a thoroughbred horse breeding farm. When the market in thoroughbreds declined, their stock was almost worthless; they sued a stable full of defendants but lost on every claim. 1

The Casares and Schultz actions were harnessed with five others; the plaintiffs collectively asserted almost twenty claims, most of which were based on the same allegedly fraudulent acts and omissions. Most of the claims were disposed of on summary judgment, the district court directed a verdict on a couple others and the jury found for the defendants on the rest. Casares had included in his complaint a claim under the Florida blue sky laws, which he lost on summary judgment because the statute of limitations had run; Schultz had alleged a violation of the Ohio RICO statute, which he voluntarily dismissed. Three sets of defendants — Frank Bryant; investment banker Bateman Ei-chler, Hill Richards and its employee Robert McGuinness; and Charles Hembree and his law firm Kincaid, Wilson Schaeffer & Hembree — sued for attorneys’ fees under the state statutes. 2

*575 Had they prevailed, Casares and Schultz undoubtedly would have sought attorneys’ fees for almost all the time spent on the case. Cf. Arceneaux v. Merrill Lynch, Pierce, Fenner & Smith, 595 F.Supp. 171, 176 (MD Fla.1984) (awarding all but 31.2 hours of 556.5 hours spent on state and federal securities claims), affirmed, 767 F.2d 1498 (11th Cir.1985). They, as plaintiffs, chose what causes of action to include in their complaints. The defendants, by contrast, were forced to defend against the claims with which they were confronted. In the absence of a contrary legislative determination, rules that benefit one class of litigants must apply to all.

Under the Florida blue sky statute, “the court shall award reasonable attorneys’ fees to the prevailing party unless the court finds that the award of such fees would be unjust.” Fla.Stat.Ann. § 517.-211(6) (emphasis added). The defendants were the prevailing parties. The Florida statute has been interpreted by the Florida courts to allow defendants to recover attorneys’ fees to the same extent as plaintiffs. Pirretti v. Dean Witter Reynolds, Inc., 578 So.2d 474, 475 (Fla.App.1991); Newsom v. Dean Witter Reynolds, Inc., 558 So.2d 1076, 1077 (Fla.App.1990) (“Because [defendant] successfully escaped liability on all counts, ... it was the prevailing party in the suit.”). The district court properly construed the statutory language as requiring an award of fees in this case. See Golub v. J.W. Gant & Associates, 863 F.2d 1516, 1521 (11th Cir.1989) (“The award of attorneys’ fees is compelled by [section 517.-211(6) ] unless the result would be unjust.”) (emphasis added). 3

Under the Ohio RICO statute, “the trial court may grant a defendant who prevails ... all or part of his reasonable attorney fees, unless the court finds that special circumstances ... make an award unjust.” Ohio Rev.Code § 2923.34(H) (emphasis added). The district court correctly held that the statute creates a presumption in favor of awarding fees. Cf. Hensley v. Eckerhart, 461 U.S. 424, 429 , 103 S.Ct. 1933, 1937 , 76 L.Ed.2d 40 (1983) (interpreting similar language in 42 U.S.C. § 1988 to create such a presumption). 4 The fee award was within the district court’s statutory discretion; Schultz makes no claim that such an award would be “unjust.” The court therefore had statutory authority to award attorneys’ fees to the defendants.

The district court found that the defendants had submitted sufficient documentation to establish the amount of time expended and the work done, as required by Chalmers v. City of Los Angeles, 796 F.2d 1205, 1210-11 (1986), amended, 808 F.2d 1373 (9th Cir.1987). Furthermore, the district court considered the factors we articulated in Kerr v. Screen Extras Guild, Inc., 526 F.2d 67, 70 (9th Cir.1975), cert. denied, 425 U.S. 951 , 96 S.Ct. 1726 , 48 L.Ed.2d 195 (1976), and concluded that the amounts claimed by the defendants were reasonable. 5 The plaintiffs do not challenge this portion of the district court’s ruling.

The problem is corralling the fees. The district court found that “the causes of action involved a common core of facts,” *576 that “[a]ll were based on related, and in some cases identical, legal theories” and that “[m]uch of defense counsel’s time had to be devoted to resisting the claims as a whole.” Order Regarding Attorneys’ Fees at 6 (March 28, 1990). The defendants did not request an award of all the fees incurred defending the action, but only for work related to the state-law claims with fee-shifting provisions. Specifically, Bate-man Eichler asked for 70% of its total expenditures, Frank Bryant for 90% and the Kincaid firm for 10%.

The court, however, was concerned that Casares and Schultz were only two of many plaintiffs, and that only two of many claims provided for fee shifting. After noting these problems, it stated that “[bjalanc-ing all of the factors, including the number of plaintiffs, the number of causes of action, and the history of this group of cases,” the defendants were entitled to five percent of their total expenditures during the period before the state-law claims dropped out of the race. Id. at 8-9. The court did not state how it arrived at that figure, nor what it was about the number of claims and plaintiffs that led it to reject the defendants’ fee requests.

II

We live in a society which, unfortunately, sanctions the view that litigation is a proper response to many of life’s hard knocks. Lawyers capitalizing on this phenomenon often multiply unnecessarily the number of legal theories under which suit is brought. The result in many cases is shotgun litigation: A barrage of claims, emanating from a point source and fanning out in the hopes of wounding someone in the process. Whatever the outcome, under the American rule each party ordinarily bears its own attorneys’ fees, although some state and federal statutes provide for fee shifting. We refer to the former as ordinary claims and the latter as shifting claims.

As lawsuits become ever more complex, and joinder, consolidation and other case management techniques are pressed into service with increasing regularity in an effort to cope with the litigation explosion, we will frequently face the problem confronting us here: Cases in which the prevailing party is entitled to recover its attorneys’ fees for some, but not all, claims. In such cases, attorneys may bill their clients for three different types of work: Work devoted solely to shifting claims, work devoted solely to ordinary claims and work that advances both ordinary and shifting claims. Awarding fees for the first two categories is easy: Work devoted only to shifting claims is recoverable; work that isn’t isn’t. The hard issue is to what extent compensation is available for the third category — work that relates to multiple claims, only some of which allow for recovery of fees. There are various allocation rules courts might apply when confronted with a multiple-claim lawsuit where a party is entitled to recover attorneys’ fees under only some of the claims.

One option is to focus on the marginal fees precipitated by the inclusion of shifting claims: The court asks what fees would have been incurred had the shifting claims not been brought, and awards only those fees exceeding that amount. Under this method, the prevailing party only recovers fees for work devoted solely to shifting claims, not fees attributable in any way to ordinary claims. The converse approach focuses on the total fees related to the shifting claims. Under this method the court determines what fees are wholly unrelated to the shifting claims, and awards all the rest. The prevailing party recovers its fees for all work somehow related to the shifting claims, but nothing for work that does not relate to those claims at all.

Both approaches are conceptually flawed. 6 The marginal fees approach un-dercompensates the prevailing party, because some of the work done on ordinary claims will always benefit the litigation of the shifting claims. Conversely, the total fees approach overcompensates: Some of *577 the work benefiting both shifting and ordinary claims might have been omitted had only the shifting claims been brought.

We therefore adopt an intermediate rule, one more closely tailored to the policies underlying fee-shifting statutes. We hold that the prevailing party may recover that amount in fees it would have incurred had the shifting claims been litigated by themselves. 7 This amount may well differ from the amount actually expended in advancing (or defending against) the claim in the context of the multiple-claim litigation. It might be less, if the parties would have litigated the shifting claims less vigorously, or compromised them early in the litigation. Or it might be more, as the parties may have devoted more resources to the shifting claims had they not been distracted by others. In any event, this method avoids both overcompensating and under-compensating the prevailing party, because the fees award is pegged precisely to the claim under which it is authorized.

Conclusion

On remand, the district court must determine what percentage of the defendants’ attorneys’ fees would have been incurred if they were defending only against Casares’ Florida blue sky claim and Schultz’ Ohio RICO claim. This figure may include expenditures incurred before the Casares or Schultz claims were part of the action if the work was related to those claims, but none incurred after the claims were dismissed. 8 The district court shall provide a clear and concise explanation of its decision, which will inform the parties— and this court, if necessary — of the basis for and reasonableness of the fee award. See D’Emanuele v. Montgomery Ward & Co., Inc., 904 F.2d 1379, 1384-86 (9th Cir.1990).

VACATED and REMANDED.

. For a more complete account of the underlying action, see McGonigle v. Combs, 968 F.2d 610 .

. Whether the defendants were entitled to fees is a question of statutory interpretation we re *575 view de novo. Cunningham v. County of Los Angeles, 879 F.2d 481, 487 (9th Cir.1988), cert. denied, 493 U.S. 1035 , 110 S.Ct. 757 , 107 L.Ed.2d 773 (1990). We review the amount of the fee award for abuse of discretion. Id. at 483.

.Casares made no showing that an award of fees would be "unjust,” nor could he. Cf. Newsom, 558 So.2d at 1077-78 (finding award unjust where elderly, inexperienced plaintiff was taken advantage of by broker with "vastly superior knowledge and control of the situation,” but noting that "[w]e do not hold by this decision that in any case where a stockbroker successfully defends a Chapter 517 claim, an attorney fee should be denied”).

. Hensley's differential treatment of plaintiffs and defendants, based on the legislative history of section 1988, does not apply to claims under the Ohio RICO statute, which explicitly authorizes awards to defendants.

. The Kerr factors are based on the Code of Professional Responsibility, Disciplinary Rule 2-106. The Florida and Ohio courts follow similar guidelines in setting attorneys’ fee awards. Standard Guaranty Ins. Co. v. Quanstrom, 555 So.2d 828, 834 (Fla. 1990); Swanson v. Swanson, 48 Ohio App.2d 85 , 355 N.E.2d 894, 898 (1976).

. A legislature could nevertheless adopt one or the other. Here we distill a default rule, in the absence of legislative expression.

. As a federal court deciding questions of state law, we attempt to discern the approach the highest court of the state would take. The Ohio courts are silent on this question, and in the absence of contrary evidence we presume they would adopt the rule we discuss in text. The Florida decisions are consistent with the rule we adopt. See Caplan v. 1616 East Sunrise Motors, Inc., 522 So.2d 920, 922 (Fla.App.1988) (awarding fees for time that "would have been spent defending any one or all of the counts") (emphasis added); Pirretti, 578 So.2d at 476 ("the effort required to defend the case was the same as to both the common law and statutory claims”) (emphasis added). In both cases the defendant would have incurred the same fees had only the shifting claims been brought; thus an award of all the fees was appropriate.

. The district court should also consider the time spent preparing the fee application, bringing the appeal and on remand.