Which of the following is true?
i. If demand is perfectly elastic, the tax creates no deadweight loss.
ii. The more elastic the supply of a factor of production, the greater is the deadweight loss from an income tax.
iii. A tax is regressive if the average tax rate rises with income.
◦ only i
◦ only ii
◦ only iii
◦ ii and iii
◦ i and ii