Assume Robbie's Robots operates in a perfectly competitive market producing 3,000 robots per day. At this output level, the selling price is $800 per robot and the marginal cost is $625 per robot. It follows that producing one more robot will cause this firm's A) total cost to decrease. B) profits to increase. C) profits to decrease. D) profits to remain unchanged.

Which of the following best explains how trade enables greater specialization among producers? a. trade diversifies the market by bringing specialized goods from around the world. b. trade requires distribution networks and adds one more step to the production process. c. trade enables producers to open up new markets for their goods and services. d. trade allows people to focus on one kind of production and trade for their other needs.