When there is an increase in demand for a particular good or item on the market then there tends to be an increase in price as there would be an increased supply to meet demand.
This refers to the economic principle which states that a certain amount of goods or items are needed to be provided to the marketplace in response to their demand.
This refers to the quantity of goods which a number of people are willing to buy in the marketplace that influences market value.
With this in mind, we can see that if there is a reduction in demand of a product, then this would bring about a reduction in price of the good or service.
Please note that your question is incomplete so I gave you a general overview to help you better understand the concept.
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