They're often valuable for vastly different reasons â like the World War II-era coins minted from atypical metals, or double-printed pennies â but each one is easy to miss if you're not paying attention. See also: Californian Couple Finds $10 Million Worth of Gold Coins in Tin Can.
A subsistence economy is a non-monetary economy which relies on natural resources to provide for basic needs, through hunting, gathering, and subsistence agriculture.
Pastoralism is a subsistence pattern in which people make their living by tending herds of large animals. The species of animals vary with the region of the world, but they are all domesticated herbivores that normally live in herds and eat grasses or other abundant plant foods.