Grandma's Pets (Grandma) is a small pet toy manufacturing business. "Little FuFu" (FuFu) is a small local pet store that sells small pets and pet toys. On May 1, 2022, Grandma sends FuFu an offer form offering to sell 50 small chewy toys for $100.

When FuFu gets the offer on May 4, it is very excited. So, immediately (on May 4) FuFu calls Grandma and tells Grandma FuFu agrees and it will send the $100 immediately to Grandma. However, Grandma then tells FuFu it will not ship the goods because it discovered that other pet stores would pay $200 for the same toys. Grandma tells FuFu that FuFu must pay $200 to get the 50 pet toys.