In th 1600s and 1700s, european plantations in the west indies

they produces sugar..

hope this , question was a little open ended

its tr3way you already know

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .