zoning boards. The purpose is to minimize the extent to which the buyer relies on any representations or
warranties of the seller in making its decisions about the transaction.
Mistake
Not all mistakes are created equal: Some mistakes lead to voidable contracts; others create enforceable (if
unfortunate) deals. How can we know the difference? First, we must ask who was mistaken because
different rules apply to unilateral and mutual mistakes. We must also examine the character of the
mistake to see if its circumstances warrant rescission.
Unilateral Mistake
Sometimes one party enters a contract under a mistaken assumption; the other is not mistaken. In
these cases it is not easy for the mistaken party to rescind a contract.
Mutual Mistake
A mutual mistake occurs when both contracting parties share the same mistake. If the contract is
based on a fundamental factual error by both parties, the contract is voidable by either one.
Case: Donovan v. RRL Corporation4
Facts: Brian Donovan, in the market for a used car, spotted a newspaper ad for a local Lexus dealer
listing a sapphire blue Jaguar XJ6 Vanden Plas for $25,995. Jaguars of the same year and mileage cost
about $8,000 to $10,000 more than the auto at the Lexus agency. Brian and his wife went to the dealer
and attempted to purchase the car for the listed price. The dealer refused; it had paid $35,000 for the
Jaguar and intended to sell it for about $37,000. The price in the newspaper ad arose from the
newspaper’s typographical and proofreading errors, although the Lexus dealership had failed to review
the proof sheet before the ad went to press. Brian sued. The trial court found that unilateral mistake
prevented enforcement. The appellate court reversed, and Donovan appealed to the state’s highest court.
Issue: Did the Lexus dealer’s mistake entitle it to rescind the contract?
Holding: Judgment for the Lexus dealer affirmed. The court first ruled that there was in fact a contract
between the parties, noting that despite the general rule that a newspaper advertisement is merely a
solicitation for an offer, a California statute generally holds automobile dealers liable to the terms of their
offers.
Next the court considered the mistake:
A significant error in the price term of a contract constitutes a mistake regarding a basic assumption
upon which the contract is made, and such a mistake ordinarily has a material effect adverse to the
mistaken party. The defendant must show that the resulting imbalance in the agreed exchange is so
severe that it would be unfair to require the defendant to perform. Measured against this standard,
defendant’s mistake in the contract for the sale of the Jaguar automobile constitutes a material mistake
regarding a basic assumption upon which it made the contract. Enforcing the contract with the
mistaken price of $25,995 would require defendant to sell the vehicle to plaintiff for $12,000 less than
the intended advertised price of $37,995-an error amounting to 32 percent of the price defendant
intended. If we were to accept plaintiff’s position that that the dealer always must be held to the strict
terms of a contract arising from an advertisement, we would be holding that the dealer intended to
assume the risk of all typographical errors in advertisements, no matter how serious the error and
regardless of the circumstances in which the error was made.
Question: I thought an advertisement was merely an invitation for an offer. Why did this
advertisement create an offer?
4 26 Cal.4th 261, 27 P.3d 702, 109 Ca. Rptr.2d 807 Supreme Court of California, 2001