Greenlee Tool Company (Greenlee) appeals from a $549,562:64 judgment obtained by Manufacturing Research Company (MRC) on a common law unfair competition claim. The suit grew out of the competition between the two companies in the manufacture and sale of a tool used in the electrical construction trade, known ■ as a power cable bender. Both as to appeal and cross-appeal, we affirm.
On the main appeal Greenlee contests the judgment based on a jury verdict on four grounds: (1) the sufficiency of the evidence as to the tort of trade disparagement or the tort of interference with advantageous business relationships, (2) the trial court’s refusal to instruct the jury on the issue of puffing, (3) the trial court’s denial of its motion for judgment notwithstanding the verdict and order of a partial retrial, and (4) the sufficiency of the evidence at the retrial on damages.
MRC had originally asserted Sherman Act claims and appeals from a directed verdict against it on a count under § 2 of the Act, alleging an attempt to monopolize. MRC also claims on cross-appeal that the trial court erred in (1) denying its motion to compel discovery seeking to establish Greenlee’s market power in the conduit bender market and (2) refusing to permit certain deposition testimony to be read to the jury.
Background
When Silas Crees invented a tool that filled a need in the electrical contracting industry, he formed the plaintiff corporation MRC to manufacture and sell the power cable bender to electrical wholesale supply houses. A cable bender is used to bend large diameter electric cable within the limited confines of a panel or terminal box. Before its invention the task was usually accomplished with the use of hand tools. The MRC power cable bender first appeared on the market in October 1970.
Early in 1971 defendant Greenlee, a well established company that markets a wide range of products for the electrical trade, became aware of the MRC power cable bender and began efforts to develop its own. A ratcheting cable bender was introduced by Greenlee in March 1973 and a power cable bender in May 1975. Both MRC and Greenlee marketed their products by employing salesmen who sold the tools to electrical wholesale supply houses or distributors that in turn sold the tools to the electrical contractors who were the end users.
The activity of Greenlee prior to marketing its own power cable bender is the basis for this suit. Beginning in May 1971 various Greenlee employees made statements to the effect that Greenlee would have a power cable bender that was better and cheaper than MRC’s on the market soon, shortly, or in a few months. These statements were made at trade shows, at distributor warehouses, and elsewhere to the trade, even though Greenlee had no such power tool and was not to market it until some four years later. Although MRC’s sales rose from the introduction of its cable bender in October 1970 until June 1971, when the rumors started, by 1975 it was no longer a viable force in the market. Thinly capitalized, MRC eventually went out of business in May 1977 by sale of its assets to Electro-vision, Inc.
Sufficiency of Evidence as to Economic Torts
, At the first trial of this case, the jury on two special interrogatories found *1040that Greenlee did engage in unfair competition which proximately caused damage to MRC- Included within unfair competition is the tort of interference with business relations. Under Florida law its elements are (1) the existence of a business relationship under which plaintiff has legal rights, (2) an intentional and unjustified interference with that relationship, and (3) damage to the plaintiff as a result of the defendant’s actions. Wackenhut Corp. v. Maimone, 389 So.2d 656 (Fla. 4th D.C.A.1980).
The jury verdict should be upheld if there is evidence of such quality and weight that reasonable and fair-minded men in the exercise of impartial judgment might reach different conclusions. The evidence is considered in the light and with all reasonable inferences most favorable to the opposing party. Boeing Co. v. Shipman, 411 F.2d 365, 374 (5th Cir.1969).
There was substantial evidence presented that Greenlee employees made statements that Greenlee would soon make available a better, cheaper cable bender at a time when there was no reasonable basis for such claims. These statements were made in 1971 and 1972 to persons involved in the electrical contracting business, principally at various trade shows throughout the country. Contrary to these statements, Greenlee’s hand-operated cable bender was not introduced until March 1973, and Green-lee’s power cable bender was not introduced until May 1975. There was evidence that one sales representative and one potential investor in MRC relied, at least in part, on the rumor concerning the imminent appearance of Greenlee’s cable bender in deciding to terminate their relationships with MRC.
The jury had sufficient evidence before it to find Greenlee liable for interference with advantageous business relationships. MRC had established a business relationship with its sales representatives and various distributors of its product. The statements attributed to Greenlee employees were made without a basis in fact. Even though Greenlee had begun development of a power cable bender of its own, the tool’s appearance on the market was far from imminent. The jury could have concluded the statements were either calculated to diminish the market for MRC’s cable bender or made knowing the market was substantially certain to be diminished. The question of justification involves a balancing of the interests of the parties and of society as well as consideration of all the circumstances including the methods, and means used and the relation of the parties. Insurance Field Services, Inc. v. White & White Inspection & Audit Service, Inc., 384 So.2d 303, 306-07 (Fla. 5th D.C.A.1980). Although businesses are accorded leeway in interfering with their competitors’ business relationships, they must abide by certain “rules of combat” and not use improper means of competition. W. Prosser, Torts 956 (4th ed. 1971). Accordingly, “when there is room for different views, the. determination of whether the interference was improper or not is ordinarily left to the jury, to obtain its common feel for the state of community mores and for the manner in which they would operate upon the facts in question.” Restatement of Torts 2d § 767 comment 1.
Puffing
Greenlee’s second argument is that the trial court erred in refusing to instruct the jury with regard to puffing. The trial court ruled that Greenlee was not entitled to a jury instruction on puffing because at the time the statements were made Green-lee had no product.
Puffing generally refers to an expression of opinion not made as a representation of fact. Gulf Oil Corp. v. Federal Trade Commission, 150 F.2d 106, 109 (5th Cir.1945). Sellers of goods are given some latitude in enhancing the quality or value of their wares. Id. Statements' made to puff goods are not actionable in misrepresentation even if untrue on the theory that no reasonable person would rely on general claims of superiority made by a salesman. W. Prosser, supra at 722. See also 1A R. Callmann, Unfair Competition, Trademarks and Monopolies § 5.19 (4th ed. 1981) (exaggerations should be allowed only where the *1041ordinary purchaser understands he is not expected to rely). Where puffing is involved, the seller is entitled to an instruction along these lines.
Each of Greenlee’s requested jury instructions deals with the limited protection afforded sellers in making comparisons of their products with competitors’ products. Greenlee, however, did not in fact have a cable bender at the time the statements in question were made and could not have marketed its cable bender soon after the statements were made. The statements complained of were made in 1971 and 1972 even though Greenlee’s hand-operated bender was not marketed until September 1973 and its power cable bender was not marketed Until May 1975. In March 1971 Greenlee’s engineering department developed design sketches of a hydraulic bender that were abandoned in favor of an outsider’s prototype. Field tests of the prototype did not begin until the summer of 1972. In short, Greenlee had nothing to be puffed at the time the statements were made. The requested instructions are not applicable in such a situation.
The damaging feature of the statements was that Greenlee’s product would be available shortly. This was a factual misrepresentation. Greenlee did not even have a product in the final development stage, nor would one be available soon. Statements misrepresenting a product or falsely ascribing benefits or virtues to a product are actionable. Gulf Oil Corp. v. Federal Trade Commission, 150 F.2d at 109; W. Prosser, supra at 926. The jury instructions included adequate instruction on misrepresentation of material facts.
Judgment Notwithstanding the Verdict
The jury returned a verdict against Greenlee for lost profits in the amount of $67,218.25 and for loss in value of MRC’s business in the amount of $286,752.50. The trial court subsequently ordered a remitti-tur in the amount of $238,707.75 or, in the alternative, a new trial on damages. After the retrial on damages the jury returned a verdict against Greenlee and found lost profits in the amount of $182,562.64 and loss of value in MRC’s business in the amount of $367,000.00. Rather than a new trial on damages, Greenlee contends it was entitled to judgment n.o.v. after the first trial.
Contrary to Greenlee’s argument, there appears to be no error in the trial court’s refusal to grant judgment notwithstanding the verdict. Although the trial court stated the testimony of MRC’s expert as to the loss in value of its business was too speculative to support the jury verdict, it did not hold that MRC had failed to prove any damage. The fact of damage proximately caused by Greenlee’s conduct was specifically found by the jury in the special interrogatories. Holding that the jury award was against the weight of the evidence, the trial court entered an order for remittitur or, in the alternative, a new trial on damages only. Reviewable under the abuse of discretion standard, see Love v. Sessions, 568 F.2d 357 (5th Cir.1978), the trial court’s decision to give a new trial was not reversible error.
Partial Retrial on Damages
Greenlee objects to the retrial solely on the issue of damages, contending the issues of liability and damages are so interwoven in this case that they cannot fairly be tried separately. See Gasoline Products Co. v. Champlin Refining Co., 283 U.S. 494, 500, 51 S.Ct. 513, 515, 75 L.Ed. 1188 (1931); Atkinson v. Dixie Greyhound Lines, 143 F.2d 477, 479 (5th Cir.), cert. denied, 323 U.S. 758, 65 S.Ct. 92, 89 L.Ed. 607 (1944). Greenlee argues that no finding was made as to which statements were found by the first jury to be tortious. On retrial the jury was able to assume each incident was tor-tious and left only to determine causation and damages. The defendant, however, did not object to special interrogatories nor did it request any interrogatories to make the distinction it now asserts. The jury specifically found liability. The repetition of some of the liability evidence, necessary to establish causation, did not render the trial unfair. Trial of damages alone after liabili*1042ty is an established practice. See, e.g., Shelak v. White Motor Co., 581 F.2d 1155 (5th Cir.1978); 6A J. Moore, Federal Practice ¶ 59.06 (2d ed. 1982); Annot., 85 A.L.R.2d 9 (1962). We find no abuse of discretion by the trial judge. See United States v. Horton, 622 F.2d 144 (5th Cir.1980).
Sufficiency of the Evidence at Retrial
Greenlee’s final contention on appeal is that there was insufficient evidence as‘to causation and damages adduced at retrial to present a jury question. The fact of injury was well established. MRC’s sales dropped off dramatically at the time the rumor began to be circulated, Gonzalez testified he lost interest in investing in MRC on hearing that Greenlee was going to introduce a cable bender “in the very near future,” Roth testified he ceased representing MRC on the basis of innuendos about Greenlee’s tool, Burnside testified he decided against investing in or representing MRC after learning that a Greenlee cable bender would be on the market soon, and Childers testified he stopped actively promoting as a manufacturer’s representative the MRC bender when he heard Greenlee’s bender was about to be marketed. There was also testimony from several witnesses that they had been unsuccessful in efforts to locate an MRC bender. The jury could have inferred that the rumor concerning Greenlee’s bender caused the disinterest of salesmen, distributors and others in the MRC cable bender.
While the amount of damages presents a more difficult question, the record supports the trial court’s refusal to disturb the jury verdict. By its very nature the valuation of lost profits is a matter of some imprecision. See New Amsterdam Casualty Co. v. Utility Battery Manufacturing Co., 122 Fla. 718, 166 So. 856, 860 (1936) (anticipated profits are speculative and dependent on changing circumstances). This inherent uncertainty does not, however, preclude recovery of damages proved to a reasonable certainty. Aldon Industries, Inc. v. Don Myers & Associates, Inc., 517 F.2d 188, 191 (5th Cir.1975).
Although the fact that MRC had not been in business long makes it difficult to forecast future sales, it is not impossible. Short base periods for the comparison of sales have been used in other cases where necessary. See, e.g., Heatransfer Corp. v. Volks-wagenwerk, A.G., 553 F.2d 964, 983 (5th Cir.1977), cert. denied, 434 U.S. 1087, 98 S.Ct. 1282, 55 L.Ed.2d 792 (1978) (five months); Mechanical Wholesale, Inc. v. Universal-Rundle Corp., 432 F.2d 228 (5th Cir.1970). In this case one witness used six months as the period during which MRC made sales unfettered by any rumors, and one used a one-year period to estimate lost sales. Comparison of sales before the unfair competition with sales afterwards is one of the generally recognized- methods of proving lost profits. See Lehrman v. Gulf Oil Corp., 500 F.2d 659, 667 (5th Cir.1974), cert. denied, 420 U.S. 929, 95 S.Ct. 1128, 43 L.Ed.2d 400 (1975).
Greenlee’s objections to the testimony of the witnesses are of the type properly addressed to the jury. The fact that the jury’s verdict was less than the figures proposed by MRC indicates the jurors accorded some credence to Greenlee’s vigorous attack on the figures and methods employed by the witnesses. The arguments do not afford a basis for setting aside the jury verdict.
Cross-Appeal
MRC has cross-appealed from three rulings by the trial court, all dealing with its claim that Greenlee attempted to monopolize the cable bender market in violation of § 2 of the Sherman Act, 15 U.S.C.A. §2. We hold the trial court did not err in refusing to compel discovery by which MRC sought to establish Greenlee’s market power in the conduit bender market, in excluding testimony concerning Greenlee’s conduct in the conduit bender market, and in granting Greenlee’s motion for directed verdict on the counts alleging conspiracy to monopolize and attempted monopolization. Citing several Fifth Circuit cases, MRC reasons that Greenlee’s market power coupled with its unfair competition amount to a *1043violation of the Sherman Act. We agree with the district court that the relevant market was the cable bender market, and therefore the district court correctly denied discovery of Greenlee’s conduit bender sales.
In Northwest Power Products, Inc. v. Omark Industries, Inc., 576 F.2d 83 (5th Cir.1978), cert. denied, 439 U.S. 1116, 99 S.Ct. 1021, 59 L.Ed.2d 75 (1979), the Court indicated a violation of the Sherman Act could be found in the anticompetitive conduct of a new entrant with dramatic market power. Id. at 89. Cherokee Laboratories, Inc. v. Rotary Drilling Services, Inc., 383 F.2d 97 (5th Cir.1967), cert. denied, 390 U.S. 904, 88 S.Ct. 816, 19 L.Ed.2d 870 (1968), was cited as an example. In that case the new entrant into the market controlled supply through an exclusive dealing arrangement with the holder of a patent and was able to increase price significantly while serving a small portion of the market. In a later case the defendant was shown to have dramatic market power in the aircraft outfitting business it had recently entered. Associated Radio Service Co. v. Page Airways, Inc., 624 F.2d. 1342 (5th Cir.1980), cert. denied, 450 U.S. 1030, 101 S.Ct. 1740, 68 L.Ed.2d 226 (1981). Defendant surmounted the high entry barrier to the market by theft of plaintiff’s trade secrets and employees and then demonstrated market power in the outfitting business by increasing prices and profits and by its exclusive worldwide dealership of the aircraft in question. Id. at 1353.
Greenlee does not control supply in the cable bender market, nor has it increased price or made excessive profits. There was no evidence that Greenlee ever coerced a distributor not to stock a competitor’s product. Greenlee’s success with other products may have aggravated the damage to MRC caused by the rumor campaign, but it did not represent dramatic market power in a market it had not yet entered. Nor do conduit benders and cable benders constitute a cluster of products. Different services were lumped together in United States v. Grinnell Corp., 384 U.S. 563, 86 S.Ct. 1698, 16 L.Ed.2d 778 (1966), and in United States v. Philadelphia National Bank, 374 U.S. 321, 83 S.Ct. 1715, 10 L.Ed.2d 915 (1963), only because demand forced competitors to offer the entire cluster of services as effectively one product. The same cannot be said of tools for electrical contractors as seen by MRC’s initial success on the basis of one tool.
Furthermore, MRC has failed to demonstrate any cognizable anticompetitive effect of Greenlee’s unfair competition. Our cases have recognized that injury to a competitor need not always result in injury to competition. The use of unfair means resulting in the substitution of one competitor for another without more does not violate the antitrust laws. Redwing Carriers, Inc. v. McKenzie Tank Lines, Inc., 594 F.2d 114 (5th Cir.1979), affirming 443 F.Supp. 639 (N.D.Fla.1977); Northwest Power Products, Inc. v. Omark Industries, 576 F.2d at 90; Southland Reship, Inc. v. Flegel, 401 F.Supp. 339 (N.D.Ga.1975), aff’d, 534 F.2d 639 (5th Cir.1976). The number of competitors in the cable bender market has increased, the number of available products has increased, and the price of available products has decreased. No anticompetitive effect on the market can be shown. Accordingly, we affirm the district court’s grant of directed verdict in favor of Green-lee on the attempted monopolization count.
We find no abuse of discretion in the exclusion of the deposition testimony because its potential for prejudice outweighed its probative value. No proof of any connection between Greenlee’s conduct in the conduit bender market and that in the cable bender market was offered. The testimony of Van Bree may have shown the existence of Greenlee’s power to coerce distributors, but no use of such power was shown with respect to any product.
Finally, the only foundation for Larson’s estimate of the percentage of Greenlee power benders sold in his sales territory as opposed to Enerpac benders was that Ener-pac was the only other brand he saw in his territory. This is clearly insufficient information on which to base such a comparison. *1044Even if there were an adequate foundation for Larson’s testimony, Greenlee’s share of the conduit bender market has been determined to be irrelevant to the cable bender .market. We affirm the trial court’s exclusion of this testimony.
AFFIRMED.