At the same time postal compensation was rising, many people switched from mailing letters to using email and other digital messages, a change in tastes away from the Postal Service. Holding supply of postal services fixed, what happens to the demand curve for postal services, and to the equilibrium price and quantity?

1. A shift away from snailmail toward digital messages is a change in tastes, a demand-side event. 2. Fewer people wanting postal services at every price shifts the demand curve for postal services to the left. 3. A leftward demand shift moves the new equilibrium down along the unchanged supply curve. 4. Both quantity and price fall together, since buyers want less at every price and sellers accept less for it. 5. Options A and C get at least one direction wrong. _Source: OpenStax Principles of Macroeconomics for AP Courses (CC BY 4.0), Ch 3 "Demand and Supply", section 3.3 | Changes in Equilibrium Price and Quantity: The Four-Step Process_