The Family Stone: Cavemen, Trade, and Comparative Advantage

By Fulmer, Richard W. | Freeman, December 2011 | Go to article overview

The Family Stone: Cavemen, Trade, and Comparative Advantage


Fulmer, Richard W., Freeman


Imagine a Stone Age family: Papa Stone, Mama Stone, and their two little pebbles. Suppose that, as befits pre-women's-lib Neanderthals, Papa Stone is initially more competent at every prehistoric survival skill: hunting, fishing, nut-and-berry gathering, firebuilding, tool-making. Despite his superior talents, it does not make sense for other family members to sit around waiting for him to do everything. Instead the family is better off if dad does those things that only he can do - hunting perhaps - while the others tackle those tasks that they can do well enough.

In this example Papa Stone has what economists call a "comparative advantage" in hunting while the children have a comparative advantage in collecting firewood. Even though dad can collect firewood more efficiently than the children, the family's opportunity cost in lost game outweighs its benefit from the incremental tinder he could collect were he to forgo hunting in favor of gathering wood.

Once tasks are divided up among the members of the family, each will soon become more adept at his or her work until dad ceases to be the preeminent expert in all things Stone Age. Family productivity will increase and the Stones will become materially better off.

Suppose the members of a neighboring family, the Gravels, are far less capable than the Stones. Despite the disparity in skills, or rather because of it, each family can still gain by trading goods and services -just as the Stones benefitted individually by in effect trading goods and services among themselves. For example, let's say it takes the Gravels two hours to gather a stack of wood and ten hours to capture a rabbit, while it takes the Stones only one hour of labor per stack of wood and three per rabbit. If the Gravels give the Stones four stacks of wood in exchange for one rabbit, they save two hours of labor while the Stones save one.

The exchange creates wealth. Both families gain time they can spend in leisure or in increasing their own material well-being. Note that no trade will occur unless each family benefits. Because of the opportunity for gain that trade offers, though, each family has an incentive to discover its comparative advantages with respect to the other and to find those things that can be exchanged to their mutual benefit. Through trial, error, and observation they will quickly learn the ways in which they can best serve each other.

Not only does trade increase the families' wealth, it also makes them more resilient in hard times. If Papa Stone's hunt goes badly today his family may have better luck gathering nuts and berries. If not, the Gravels might have fared better and be willing to exchange some of their harvest for a garment or tool that Mama Stone crafted. The community becomes more resilient as additional families are included in the circle of trade, allowing the realization of economies of scale and a finer division of labor.

Perhaps most important trade brings with it new knowledge and new thoughts. Far more valuable than a tool is the idea of a tool - a rock is just an inert lump until, mixed with knowledge, it becomes a hammer, club, or building block. …

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The Family Stone: Cavemen, Trade, and Comparative Advantage
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