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A baker wanted to buy a warehouse for a new commercial kitchen. The owner signed a writing granting the baker the exclusive right to buy the warehouse for $900,000 at any time during the next 60 days. The baker paid $500 for the right, and the owner accepted it. Thirty days later, the owner received a higher offer and attempted to revoke.
Separately, a merchant oven supplier signed a letter to the baker stating, "We will hold open our offer to sell 40 ovens at $3,000 each for six months." The baker paid nothing for the promise to keep the offer open. Four months later, the supplier attempted to revoke before the baker accepted. Finally, a donor signed a pledge to pay the baker's nonprofit culinary school $100,000 to name a classroom for the donor's family. Relying on the pledge, the school signed a construction contract and began work, but the donor later refused to pay.
Analyze whether each promise to keep an offer open or pledge money is enforceable.