The amount of a good or service that consumers are willing and able to purchase at a specific time is the demand.
In economics, demand is the amount of a good that consumers are willing and able to buy at different prices over a certain time period. The demand curve is the relationship between price and quantity demand.
A shift in demand reflects a shift in consumer willingness to purchase a specific commodity or service, regardless of price variance. A shift in income levels, consumer choices, or a different price for a related product could be the catalyst for the change.
According to the rule of demand, as the price of a thing falls, so does the quantity requested for that good.
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