What kind of change in the market for a good is capable of shifting its entire demand curve to a new position, rather than just moving buyers along the existing curve?

1. A shift in demand happens when some factor other than the good's own price changes. 2. The price of a related good, like a substitute or a complement, is exactly this kind of outside factor. 3. Because that factor is not the good's own price, it moves the whole demand curve rather than sliding buyers along it. 4. Option B is the one change that never shifts the curve; it only produces movement along it. _Source: OpenStax Principles of Macroeconomics for AP Courses (CC BY 4.0), Ch 3 "Demand and Supply", section 3.2 | Shifts in Demand and Supply for Goods and Services_