Given the products below and the events that affect them, indicate what happens to demand, supply, equilibrium quantity, and equilibrium price. Identify the determinant of demand and supply that causes the shifts.
(a) Calculators. More schools require students to buy and use calculators; improved productivity shortens the time it takes to make calculators.
(b) Gasoline. Oil production declines due to a crisis in the Middle East; people take more car vacations and drive more.
(c) New homes. The average incomes fall as the economy moves into recession; the productivity of home construction workers and builders increases.