This is a motor vehicle tort case arising out of a fatal accident involving a 1976 Chevrolet Corvette automobile manufactured by General Motors Corporation (General Motors) and owned by Donahue Chevrolet, Inc. (Donahue Chevrolet). In the complaint, Katherine E. Mason, as administratrix of the estates of Robert L. Day, Sr., and Robert L. Day, Jr., and as representative of the decedents’ next of kin, made claims for conscious suffering and wrongful death against General Motors and Donahue Chevrolet due to negligence and breach of warranty. On the same grounds, Mason, as the temporary conservator of the estate of Marguerite M. Day, and thereafter, Marguerite M. Day on her own behalf sought consequential damages and damages for loss of consortium. The complaint was subsequently amended to add claims for negligent infliction of emotional distress against the defendants. Prior to trial, Donahue Chevrolet moved for summary judgment on the breach of warranty counts against it on the ground that there was “no allegation that the vehicle in question was sold or leased by the defendant to any of the plaintiffs or their decedents.” The motion was granted. After a lengthy trial, the jury returned verdicts for the defendants on all the remaining counts. The plaintiffs appeal from the allowance of Donahue Chevrolet’s motion for summary judgment and from the judgment entered for General Motors. We transferred this case from the Appeals Court on our own motion. There was no error.
*185For introductory purposes only, we summarize the facts the jury could have found based on the evidence introduced at trial. On the morning of April 21, 1976, Robert L. Day, Sr., and his son, Robert L. Day, Jr., were killed when the automobile they were driving, a 1976 Chevrolet Corvette Stingray, struck a cable guardrail on Route 111 in Groton. Prior to the accident, Donahue Chevrolet had used the accident vehicle for demonstration purposes, and the vehicle had been driven to and from the dealership by the general manager of Donahue Chevrolet. On the morning of the accident, the Days went to Donahue Chevrolet to inquire about service for a vehicle which the elder Day had recently purchased from the dealership. During a conversation with the general manager, the elder Day mentioned that his son had never had a ride in a Corvette and asked permission to take the accident vehicle for a drive. The general manager responded affirmatively to his request and gave him the keys to the vehicle. Approximately fifteen minutes later, the Days were fatally injured.
Although no one observed the accident, the evidence indicated that the elder Day lost control of the vehicle and the vehicle skidded off the road and collided with a two-cable guardrail. There was expert testimony that the vehicle was travelling between seventy and eighty miles an hour at the time of the accident. At the point of impact, it could have been found that the upper cable rode over the hood of the car, cut through the “A pillars” on either side of the windshield, and virtually decapitated the Days.
1. Summary Judgment.
Donahue Chevrolet argues that, even if the breach of warranty claims against the dealership were improperly dismissed, the plaintiffs are estopped from litigating those claims on remand because of the jury verdicts for General Motors on the breach of warranty claims asserted against it. If we were to agree with Donahue Chevrolet’s estoppel argument, it would be unnecessary for us to consider whether the judge was correct in allowing the summary judgment motion.
We agree that the plaintiffs should be estopped from relitigating claims that the vehicle was defectively designed. But the *186record before us does not permit us to conclude that the plaintiffs’ breach of warranty claims against Donahue Chevrolet are limited to design defects. The amended complaint is not so confining, and we have been furnished with no affidavits or other materials which would justify the conclusion that the plaintiffs’ claims do not include defects arising after delivery of the vehicle to Donahue Chevrolet. If the plaintiffs’ breach of warranty claims against Donahue Chevrolet were otherwise sufficient to withstand a motion to dismiss, which we hold they were not, the plaintiffs would not be precluded from presenting claims they never have had the opportunity to present. Surely the plaintiffs’ failure to present evidence of post-delivery defects at trial, after Donahue Chevrolet’s motion to dismiss the breach of warranty claims against it had been allowed, would not bar the plaintiffs from litigating those claims for the first time on remand.
Having concluded that the plaintiffs would not be estopped from litigating their breach of warranty claims against Donahue Chevrolet we come to the question whether summary judgment was correctly granted. As we have noted, the record appendix does not show what documents were presented to the judge in connection with Donahue Chevrolet’s summary judgment motion. In their brief in this court, however, the plaintiffs rely on Donahue Chevrolet’s answers to interrogatories as establishing, for the purpose of dealing with the summary judgment motion, that the accident happened while the elder Day, as a potential customer and with Donahue Chevrolet’s permission, was testdriving the vehicle. We consider the motion on that basis. The parties agree that the issue is whether, as Donahue Chevrolet contends, a sale, or a contract to sell, or a lease is necessary in order for a warranty of merchantability to be implied under Massachusetts law. If Donahue Chevrolet’s contention is correct, as we hold it is, the judge properly allowed the motion for summary judgment.
General Laws c. 106, § 2-318 (1984 ed.), provides in pertinent part that “ [l]ack of privity between plaintiff and defendant shall be no defense in any action brought against the manufacturer, seller, lessor or supplier of goods to recover damages *187for breach of warranty, express or implied, or for negligence, although the plaintiff did not purchase the goods from the defendant if the plaintiff was a person whom the manufacturer, seller, lessor or supplier might reasonably have expected to use, consume or be affected by the goods.” The plaintiffs argue that, although there was no privity between the Days and Donahue Chevrolet, the Days were potential customers trying out the accident vehicle and therefore they were persons “whom the . . . supplier [Donahue Chevrolet] might reasonably have expected to use, consume or be affected by” the vehicle. The plaintiffs conclude that, if the vehicle was defective when the Days took possession of it, and their injuries and death were caused by the defect, they are entitled to damages from Donahue Chevrolet on a breach of warranty theory.
It is true, of course, that under G. L. c. 106, § 2-318, lack of privity between a plaintiff and a defendant is not a defense to a claim for breach of an implied warranty of merchantability. But, the fact that lack of privity is not a defense to a breach of warranty claim sheds no light on the logically prior question whether a warranty has indeed been made. Despite the motion’s imperfect statement of grounds for the grant of summary judgment, the principal question raised by the motion is whether Donahue Chevrolet warranted the vehicle to anyone — not whether the Days or the plaintiffs may claim the benefit of any warranty that may have been made.
The Uniform Commercial Code was enacted in this Commonwealth in 1957, effective October 1, 1958. St. 1957, c. 765. General Laws c. 106, § 2-314, as appearing in St. 1957, c. 765, § 1, provides in material part that “a warranty that the goods shall be merchantable is implied in a contract for their sale if the seller is a merchant with respect to goods of that kind.” That section creates and defines an implied warranty of merchantability, and it also prescribes the type of transaction in which a warranty of merchantability is implied, namely a contract for the sale of goods. In turn, G. L. c. 106, § 2-106, as appearing in St. 1957, c. 765, § 1, defines a contract for the sale of goods as including both a present sale of goods and a contract to sell goods at a future time. Section 2-106 also *188provides that a “ ‘sale’ consists in the passing of title from the seller to the buyer for a price.” Read together, §§ 2-314 and 2-106 provide that a warranty of merchantability is implied in two situations: (1) when title to goods passes for a price, and (2) when a contract is made for the future passing of title to goods for a price.
The function of G. L. c. 106, § 2-318, as appearing in St. 1957, c. 765, § 1, was not to create or define a warranty, or to determine the type of transaction in which a warranty would be implied, but rather was to describe the class of persons who would benefit from warranties recognized elsewhere in the statute. Originally, that class of persons was limited to members of the family or household of the buyer and to the buyer’s guests, but the class was subsequently enlarged by St 1971, c. 670. That statute amended G. L. c. 106, § 2-318, to extend the statutorily recognized warranties to all persons “whom the manufacturer, seller or supplier might reasonably have expected to use, consume or be affected by the goods.” Then, St. 1973, c. 750, struck G. L. c. 106, § 2-318, and inserted a new § 2-318 in its place.
As appearing in St. 1973, c. 750, § 1, § 2-318 provided, in pertinent part, as follows: “Lack of privity between plaintiff and defendant shall be no defense in any action brought against the manufacturer, seller, lessor or supplier of goods to recover damages for breach of warranty, express or implied, or for negligence, although the plaintiff did not purchase the goods from the defendant if the plaintiff was a person whom the manufacturer, seller, lessor or supplier might reasonably have expected to use, consume or be affected by the goods. The manufacturer, seller, lessor or supplier may not exclude or limit the operation of this section.” (Emphasis added.) Statute 1973, c. 750, further provided that the new § 2-318 “shall apply to leases which are made and to injuries which occur after the effective date of [the] act.” St. 1973, c. 750, § 2.4 As we have explained, the fact that lack of privity is not a *189defense to a breach of warranty claim against a lessor or anyone else does not establish the existence of warranties in connection with particular transactions. Nevertheless, although § 2-314 has never been amended to include leases as transactions in which a warranty of merchantability is implied, it is clear that in enacting St. 1973, c. 750, the Legislature viewed leases as transactions in which the law implies a warranty. Recognizing that fact, we said in Back v. Wickes Corp., 375 Mass. 633, 639 (1978), that “ [t]he Legislature has sanctioned the judicial extension of warranty liability, in a proper case, to nonsales transactions such as commercial leases. St. 1973, c. 750, further amending G. L. c. 106, § 2-318.”
Thus, in Massachusetts, under G. L. c. 106, § 2-314, a warranty of merchantability is implied in present sales of goods and in contracts for the future sale of goods, and, as a result of judicial extension of warranty liability sanctioned by the Legislature, § 2-318, a warranty of merchantability is implied in leases of goods. See Back v. Wickes Corp., supra at 639. There is no statutory language, however, that reasonably may be construed as either creating or sanctioning the judicial creation of a warranty in connection with a bailment of the kind that occurred in this case. It is true, as the plaintiffs have been careful to remind us, that we have said that “[a]mendments to the Massachusetts version of the Uniform Commercial Code make clear that the Legislature has transformed warranty liability into a remedy intended to be fully as comprehensive as the strict liability theory of recovery that has been adopted by a great many other jurisdictions,” id., and that we have said that warranty liability in Massachusetts is “as comprehensive as that provided by § 402A of the Restatement [(Second) of Torts (1965)].’’Swartz v. General Motors Corp., 375 Mass. 628, 630 (1978). We also said in Back v. Wickes Corp., supra at 640, that “ [t]he Legislature has made the Massachusetts law of warranty congruent in nearly all respects with the principles expressed in Restatement (Second) of Torts § 402A (1965).” *190Hayes v. Ariens Co., 391 Mass. 408, 412 (1984). Correia v. Firestone Tire & Rubber Co., 388 Mass. 342, 353 (1983). See Wolfe v. Ford Motor Co., 386 Mass. 95, 97-98 (1982). Our statements were made in cases in which sales had in fact taken place. Once a transaction has occurred in which a warranty is implied by our statute, as in the cases cited above, the nature of the warranty and the parties benefited by it are the same as, or at least very similar to, the warranties and beneficiaries recognized in § 402A of the Restatement, and the remedies are congruent. However, unlike our warranty law, under § 402A an injured plaintiff may recover damages resulting from a defective product regardless of whether title to the product passed or there was a contract to pass title to the product or the product was leased. We did not intend our statements to encompass transactions other than contracts of sale and leases. In any event, our statements did not insert in the statute words that the Legislature had not put there.
Our conclusion that our statute reasonably cannot be construed to provide the plaintiff with a remedy against Donahue Chevrolet finds support elsewhere. Numerous courts have declined to extend § 2-314 warranties to transactions other than sales. See, e.g., Allen v. Ortho Pharmaceutical Corp., 387 F. Supp. 364, 367-368 (S.D. Tex. 1974); Zanzig v. H.P.M. Corp., 134 Ill. App. 3d 617, 626-627 (1985); Stanley v. Schiavi Mobile Homes, Inc., 462 A.2d 1144, 1147 (Me. 1983); Garfield v. Furniture Fair-Hanover, 113 N.J. Super. 509, 511-512 (1971); Baker v. Promark Prods. West, Inc., 692 S.W.2d 844, 847 (Tenn. 1985). Furthermore, the plaintiffs have not cited, nor has our research revealed, any case, in any of the forty-nine States that have adopted some version of article 2 of the Uniform Commercial Code, in which a court has implied a warranty of merchantability with respect to a bailment like the one involved in this case.
Understandably, in view of our previous declarations, the plaintiffs have not urged us either to create common law warranty remedies in addition to those mandated or sanctioned by the Legislature, or to hold that in this Commonwealth there is strict tort liability apart from liability for breach of warranty *191under the Uniform Commercial Code, G. L. c. 106, §§ 2-314 — 2-318. Nevertheless, we discuss that subject briefly. Whether liability for products that are defective without fault should be imposed in this Commonwealth, and, if so, what types of transactions should give rise to liability, are matters of social policy to which the Legislature has given its attention. In Back v. Wickes Corp., supra at 639-640, and Swartz v. General Motors Corp., supra at 630-631, we decided to defer to the Legislature’s judgment in those matters, and, we believe, rightly so. We are unwilling, therefore, to hold today that, apart from liability for breach of warranty under our statute, there may be liability without fault for defective products. The Legislature is free to change the law in that regard if it chooses to do so. We hold, therefore, that the judge correctly granted Donahue Chevrolet’s motion for partial summary judgment.
2. The Trial.
The plaintiffs assign as reversible error two aspects of the trial. First, the plaintiffs argue that the judge improperly restricted their closing argument to the jury. There was evidence at trial that General Motors had not performed crash tests involving Corvette automobiles and cable guardrails. At trial, during the redirect examination of one of its witnesses, General Motors asked “why” this particular type of crash test had not been performed. The plaintiffs objected and the objection was sustained. General Motors then made several attempts to rephrase the question and on each occasion the plaintiffs objected and the objections were sustained. No explanation for the nonperformance of the tests was introduced in evidence. Prior to closing arguments, General Motors moved to preclude the plaintiffs from commenting on the fact that General Motors had not conducted such tests. The judge granted the motion. The judge reasoned that it would not be fair to allow the plaintiffs to argue this fact to the jury when General Motors had been prevented from explaining to the jury its reasons for not conducting crash tests of Corvette automobiles and cable guardrails. While it can be argued that the judge’s reasoning is not entirely correct, the ruling itself was proper nonetheless.
*192The plaintiffs argue that they should have been allowed to comment on General Motors’ failure to conduct this particular type of crash test because this failure was a fact in evidence in the case. According to the plaintiffs, a party is entitled to comment during closing argument on facts in evidence. The plaintiffs, however, overstate the scope of proper closing argument. The scope of proper closing argument is limited to comments on facts in evidence that are relevant to the issues and the fair inferences which can be drawn from those relevant facts. The burden of establishing the relevance of a fact is on the party seeking to argue that fact to the jury.
In the present case, the plaintiffs did not demonstrate to the trial judge and do not demonstrate now how the fact that General Motors did not crash-test Corvettes into cable guardrails is relevant to their claims of negligence and breach of warranty against General Motors. For example, the plaintiffs have pointed to no evidence in the record indicating that, if such a test could have been performed, useful engineering information would have been derived from the test, or that any such information would have enabled a prudent automobile manufacturer to have prevented the consequences of this particular accident. Furthermore, the plaintiffs have not shown that the performance of this particular type of crash test would have resulted in information not already known to General Motors. If General Motors already knew that the force generated from a collision between a Corvette travelling seventy miles an hour and a cable guardrail would sever the A-pillars of the vehicle, then General Motors’ nonperformance of such a test would not constitute negligence. Standing alone, General Motors’ failure to perform this particular type of crash test was simply not relevant and, therefore, the judge properly exercised his discretion in ordering the preclusion of comment on the subject.
Furthermore, the plaintiffs commented on this evidence despite the judge’s ruling. Specifically, the plaintiffs stated in their closing, “The nose [of a Corvette] is such . . . that the last and only defense were the A-pillars. . . . Now, what did they give us, what did they give us? An untested pillar, a pillar that they can’t tell you what it will resist.” The plaintiffs cannot *193properly claim now that the judge’s order, even if it was erroneous, was harmful and therefore reversible error.
Finally, the plaintiffs assert that reversal is required because the judge erroneously precluded them from reading to the jury as rebuttal evidence certain portions of the deposition of Dr. Shyne, an independent expert retained before trial by General Motors. Dr. Shyne was “noticed” by General Motors as a potential witness but was not called to testify at trial. Dr. Shyne had testified at his deposition, inter alla, that it was possible to design a pressure test of A-pillars with three-quarter inch steel cable and that it would have been possible to construct stronger A-pillars out of low alloy steel. The plaintiffs argue that because General Motors had noticed Dr. Shyne as a witness but then did not call him to testify at trial, it was unfair for the trial judge to preclude the plaintiffs from presenting portions of Dr. Shyne’s deposition testimony as rebuttal evidence.
A trial judge has substantial discretion in determining whether to allow the presentation of rebuttal evidence. Drake v. Goodman, 386 Mass. 88, 92 (1982). “There is no right to present rebuttal evidence that only supports a party’s affirmative case.” Id. In their brief, the plaintiffs admit that the proffered testimony would have demonstrated “various critical elements of the plaintiffs’ case.” As such, the plaintiffs were not entitled as a matter of right to present portions of Dr. Shyne’s deposition in rebuttal. In addition to any potential problems under Mass. R. Civ. P. 32, as amended, 392 Mass. 1105 (1984), regarding the introduction of deposition testimony, the judge was well within his discretion in precluding the presentation of such evidence in rebuttal even if it was relevant.
Judgments affirmed.