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When we consider the demand for skis, ski boots are considered__?__because skis are useless without ski boots?
inelastic - there is no substitute for ski boots
Reply:blades are better
Reply:essential , mandatory, accessories
its a bit hard to say without more context.
Reply:Related Goods. In other words, you can%26#039;t have one without the other. As the demand for skis goes up so does the demand in ski boots. A change in demand takes place.
cat skin problem
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