On January 1, Baby Store contracts with Manufacturer to purchase 500 baby walkers. Pursuant to the terms of the contract, Manufacturer shall deliver the baby walkers on January 30, whereupon Baby store will pay $10,000. On January 2, an independent organization releases findings that baby walkers are unsafe for infant use. In response, on January 10m the federal government outlaws baby walkers. Explain how the defense of change circumstances affects both parties' obligations to perform?