If only the price for a good or service changes does the demand curve shift? Why or why not?

No

Explanation:

If only the price changes for a good or service, the demand curve doesn't shift because the price is not a demand shifter. Price can change only the quantity demanded for the good or service.

The shift in demand curve can be caused by different factors, such as income, weather, taste, fashion etc. Price can lead to the movement along the demand curve but not a shift in demand curve.

answer; because they must appeal to a broad cross-section of the population;

answer; i want to hold your hand;