An unfavorable change in consumer tastes and preferences for a product will reduce demand, which is illustrated as a shift of the demand curve to the left.
The demand curve depicts the relationship between price and quantity demanded. The demand curve is negatively sloped. When prices increase, quantity demanded declines and when prices reduces, the quantity demand increases.
Only a change in the price of a good leads to a movement along the demand curve of that good.
Other factors such as a change in the taste of consumers lead to a change in demand. As a result of the unfavorable change, there would be a decrease in demand and this would lead to a shift to the left of the demand curve.
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