It is to be noted that the demand for sandwiches and ice cream cones consumed after the price of ice cream cones rises to $2 a piece will both reduce (all things being equal).
Why would the demand for both items reduce?
The demand for both goods will both come down because they are complementary or joint demand goods.
A pair of goods are termed "joint demand" when both must or usually is consumed with the other.
Recall that (where all things are equal) demand will decrease as price increases.
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