To say that markets are free means that Select one: a. the invisible hand operates and there is no government intervention O b. consumers are free to purchase all that they want at the price established by the government. Oc production, distribution, and consumption of goods is free, but the government sets minimum wages. O d. everyone produces according to his ability and receives goods and services according to his needs. Along any given demand curve, the price of a good changes. The other variable that changes as you move along a demand curve is Select one: O a, the income of the consumer. ob. the quantity of the good demanded. O c. the cost of producing an extra unit of the good. Od the prices of related goods. A change in demand can be caused by a change in Select one: O a. the price of related goods. O b. consumer incomes. . tastes. O d. All of the above