> Trade is built into our human nature. I'd go deeper than that, I'd say trade is built into nature. Forests have economies, sharing resources. Deciduous tree

> Trade is built into our human nature. I'd go deeper than that, I'd say trade is built into nature. Forests have economies, sharing resources. Deciduous trees over-produce "food" in the summer, when their big leaves pay off, which they share with the conifers. In return, the conifers (which have food year-round because they don't drop their needles) give food to the deciduous trees in early spring, before the new leaves form.