Answer: Expectations
Explanation:
 According to the given question, the position of the given demand curve are get changed based on the change in the expectations of the consumers or users for using the products such as tucker's root beer.
If the demand the given products and the services are get increased then automatically the price significantly increases.
This is due to the change in the expectations and also requirement of the customers in the market. and this concept is also refers as low of demand. Therefore, Expectations is the correct asmwer.
 Therefore, Expectations is the correct answer.