Gary's Grove sells lemons and grapefruit to local grocery stores, including Bulldog Market, which features Gary's products as part of its "Farm to Table" local producer advertising. Because this year has been particularly dry, and the pandemic; Gary's had to spend additional money for irrigation and is not making a profit on its produce. When Gary discuss the situation with the purchasing manager at Bulldogs Market, they agreed the Bulldogs Market would pay more for the lemons for the remainder of this season. Would the price increase in the contract between Gary and the Market be enforceable under common law?