Albert had cancer and was being treated by Dr. Bennington. He had carefully followed the doctor's advice, and the treatment had been successful.One day, during a periodic checkup, Dr. Bennington said to Albert, "To prevent cancer from recurring, you need to reduce the stress in your life. Long drives in the country are great for that . Come to think of it, I'm selling my convertible right now. You should buy it." Without investigating, Albert followed the doctor's directions and contracted to buy the car. Later he found the price he'd agreed to pay was nearly double the market.

Identify and explain the legal concept under which Albert can challenge this contract.