Mike's Roadside Market buys produce from area farmers, marks the merchandise at a price that includes some profit, and then sells the fruit and vegetables to the people in and around Centerville. Mike's would be classified as part of a market.

Specialization—the division of labor—enhances productivity and efficiency by a) allowing workers to take advantage of existing differences in their abilities and skills. b) avoiding the time loss involved in shifting from one production task to another. c) allowing workers to develop skills by working on one, or a limited number, of tasks. d)all of the means identified in the other answers.