Which of the following is most liquid?

Using supply and demand analysis, which of the following is true?

a. The burden of a tax on production cannot be determined on the basis of who actually pays the tax. b. The burden of a tax on production is always split evenly between consumers and sellers. c. Consumers bear the entire burden of a per unit tax on production. d. Sellers bear the entire burden of a per unit tax on production.

If a perfectly competitive firm sells 50 units of output at a market price of $10 per unit, its marginal revenue is:

a. more than $10. b. less than $10. c. $10. d. $5300.