Listen Donald was reading his twitter feed one morning and noticed an advertisement for his favourite hair spray. Best Salad Inc. was offering the hair spray at the low price of $9.95. When Donald got to the store, the sales clerk told Donald that the price was $19.95, and the advertisement was a mistake. What is Donald's legal position under contract law? Clearly the advertisement was a mistake. But because Donald did not know that Best Salad Inc. made a mistake, Donald's acceptance was binding. The store is required to sell the hairspray to Donald for $9.95. Donald should have realized that the price was a mistake. The store is not required to sell the hairspray for $9.95