What did the 13th,14th,15th amendments do? what people were the intended beneficiaries of these amendments at the time?

answer; /// i believe that the correct answer is (a) making presentations;

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 .