Pierette entered into a contract with Hugo. She agreed to deliver a shipment of gold to his jewellery store each week for a year. He agreed to pay a specific price. The contract also said: "The buyer shall have the right to terminate this contract in the event of a substantial change in the market price of gold." After delivering gold to Hugo for several months, Pierette refused to go on with the contract. Her decision to do so was based on the fact that while her contract with Hugo contained a specific price, the market value of gold had suddenly increased a substantial amount. Consequently, she realized that her contract with Hugo no longer made good financial sense from her perspective. Hugo sued Pierette.