Suppose that in Montreal in December, 2009, 10 000 ski helmets were sold at a price of $60 each. And in Montreal in December, 2010, 20 000 ski helmets were sold at a price of $80 each. One possible explanation for the change is that from 2009 to 2010 the curve for ski helmets shifted to the _ .

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The increase in the quantity sold from 10,000 to 20,000 and the increase in price from $60 to $80 suggest that there was an increase in demand for ski helmets in Montreal from 2009 to 2010. This means that the demand curve shifted to the right.

Suppose That in Montreal in December, 2009, 10 000 Ski