Fournotts Corp. launched a new line of toothpaste last year. Even when the company significantly increased the toothpaste's price, its sales did not drop. In this scenario, which of the following is the reason behind this behavior of consumers?
a. Toothpaste is a perishable product.
b. Other products can be used instead of toothpastes.
c. The demand for common items like toothpaste is in equilibrium with its supply.
d. The price of toothpastes is inconsequential to the consumers who buy them.
Answer: d.