For the sake of clarity, the examples of exchangeable goods in this chapter have mainly been taken from tangible commodities, such as horses, fish, eggs, etc. Such commodities are not the only type of goods subject to exchange, however. A may exchange his personal services for the commodity of B. Thus, for example, A may give his labor services to farmer B in exchange for farm produce. Furthermore, A may give personal services that function directly as consumers’ goods in exchange for another good.