Mayker, Inc. and Oylco contracted to have Oylco be the exclusive provider of Mayker's fuel oil for three months.

Mayker, Inc. and Oylco contracted to have Oylco be the exclusive provider of Mayker's fuel oil for three months. The stated price was subject to increases of up to a total of 10% if the market price increased. The market price rose 25% and Mayker tripled its normal order. Oylco seeks to avoid performance. Oylco's best argument in support of its position is that: