In the diagram, $S_1$ is the supply curve and $D_1$ is the initial demand for facemask X. A rival firm produces facemask Y, which is a close substitute.
What would cause the demand curve to shift to $D_2$?
1 )
a decrease in the costs of the materials to make facemask X
2 )
a decrease in the costs of the materials to make facemask Y
3 )
an increase in the price of facemask X
an increase in the price of facemask Y
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