Final answer:
Apple and Samsung work together to produce the iPhone through mutually beneficial trade. Samsung specializes in electronics parts while Apple focuses on design, resulting in gains for both companies.
Step-by-step explanation:
Apple and Samsung work together to produce the iPhone because they engage in mutually beneficial trade. Samsung is one of the world's largest electronics parts suppliers, and by allowing Samsung to focus on making the best parts, Apple can concentrate on its strength of designing elegant and user-friendly products. This division of labor allows both companies to specialize in what they do best and leads to gains for all through trade.