There are changes in demands. Why the above scenario happen is that A change in tastes and preferences increased demand.
People's tastes and preferences for different kinds of goods and services often alter or bring about change in demand.
Due to that, a change in demand will take place for the people. Some specific goods often go out of fashion or the tastes and preferences  of people is said to be not favorable to them anymore, and as such, the demand for them will decreases.
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