Consider four survivors on an island. 
Which of the following pairs of survivors has a double-coincidence of wants?
Definitions:
Profit-maximizing
The process of adjusting production and operational variables to achieve the highest possible profit margins.
Vertical Distance
The measure of the difference in height between two points, often used in mathematics and geography.
Unit Price
The cost per unit of quantity of a product, allowing consumers to compare prices between different sized packages of the same item.
Competitive Firm
A business that operates in a market where it must compete against other firms for customers and resources.
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