Draw the graph · Micro · Supply and demand
Cheaper printers, more ink
Drag a curve sideways, or use its arrows. A curve you do not move is a curve you are saying stays put. Make each shift clear enough that a reader could see it.
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Demand shifts right. Supply stays put.
Printers and ink are complements, goods used together. When printers get cheaper, more households own one, and every owner needs ink. At every ink price, buyers want more cartridges, so demand for ink shifts right. Ink makers' costs are unchanged, so supply stays put.
Price rises and quantity rises.
Common mistake. Students sometimes shift ink supply right, reasoning that 'printing got cheaper.' Printers got cheaper, not ink production. The change reaches the ink market through buyers.
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Lesson: Cross-Price Elasticity — Substitutes & Complements