Julia contracts to sell to Hayden, an ice cream manufacturer, the amount of ice Hayden may need in his business for the ensuing three years to the extent of not more than 250 tons a week at a stated price per ton. Hayden makes a corresponding promise to Julia to buy such an amount of ice. Hayden sells his ice cream plant to Clark and assigns to Clark all Hayden’s rights under the contract with Julia. Upon learning of the sale, Julia refuses to furnish ice to Clark. Clark sues Julia for damages. Decision?