Answer:
I believe economists create demand curve to predict how people will change their buying habits when prices change. A demand curve is plot of Quantity of products or services demanded in the market against the prices for a given period of time. The price appears on the horizontal axis and the quantity demanded on the y axis. The demand is the quantity of goods or services that the consumers are willing and able to buy at a given period of time.
Step-by-step explanation:
I hope this helps