Explain whether each of the following government activities is motivated by a concern about equity or a concern about efficiency. In the case of efficiency, discuss the type of market failure involved.

a. Regulating water prices.

b. Regulating electricity prices.

c. Providing some poor people with vouchers that can be used to buy food.

d. Prohibiting smoking in public places.

e. Imposing higher personal income tax rates on people with higher incomes.

f. Instituting laws against driving whilst under the influence of alcohol.