4. Xena has a car worth $8,000 (her subjective valuation), and she agrees to sell it to Yoram for $10,000 (which is $1000 under the latter's subjective valuation of the car). Just after the contract was signed and before the transaction is completed, a third person, Zachary, offers Xena $12,000. Assuming transaction costs are high, what would be the most efficient remedy for breach? Explain