Supply and demand curve (economics)?

Can I make a graph where D1 and S1 are the iPhone 4s and D2 and S2 are the iPhone 5 and I can compare the two on one graph like that?

No. The reason being is that the Supply-Demand model shows the relationship between Supply and Demand in a given market such as Smart Phones, TV's, cars, etc. The iPhone itself isn't a market; it falls under the Smart Phones category.

No, because each Iphone would be a separate graph. You could show the price change in the 4s as the D2 and S2 curves.

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