The market process avoids creative destruction

The distributed lag model is given by

A) Yt = ?0 + ?1Xt + ?2Yt-1 + ut. B) Yt = ?0 + ?1Yt-1 + ?2Yt-2 + ... + ?rYt-r + ut. C) Yt = ?0 + ?1ut + ?2ut+1 + ?3ut+2 + ... + ?r+1ut+r + et. D) Yt = ?0 + ?1Xt + ?2Xt-1 + ?3Xt-2 + ... + ?r+1Xt-r + ut.

You and two partners start a company. However, your partners play no role in running the company. You spend all your time managing the business. The time that you could have spent working for someone else and earning wages instead of running the business is your: a. explicit cost

b. marginal cost. c. sunk cost. d. opportunity cost.