Suppose that demand changes, and the (inverse) demand curve moves P = 82 -1Q to P = 90.2 -1Q. This change could be explained by

the introduction of an indirect tax on good X, such as a sales tax.

an increase in the price of an input used to produce good X.

an increase in the incomes of consumers.

a change in the tastes of consumers, reflecting that they now prefer good X less.

PART TWO:

Suppose that demand changes, and the (inverse) demand curve moves P = 82 -0.5Q to P = 73.8 -0.5Q. This change could be explained by

an increase in the price of an input used to produce good X.

the introduction of an indirect tax on good X, such as a sales tax.

an increase in the incomes of consumers.

a change in the tastes of consumers, reflecting that they now prefer good X less.