The option-value principle can be roughly stated as "more choices can't make a person worse off.". Are there any exceptions to this rule? Choose all that apply.
a. No

Identify the correct statement about a corrective tax. a. Equilibrium occurs at a lower market price after the tax is imposed

b. The social cost curve lies below the private cost curve in the absence of the tax. c. A market becomes allocatively efficient after the tax is imposed. d. The socially optimal level of output is more than the market equilibrium output in the absence of the tax.

Which market structure(s) is(are) imperfectly competitive?