Editing Native American trade (section)

===Fur trading posts===
Fur trading was one of the main economic activities in Northern America from the late 16th century to the mid-19th century. At the time, the demand for fur was surging in Europe as it was used to make cloth and fancy hats.  Data collected from [[Kingdom of England|England]] in the 18th century highlights that the years from 1746 to 1763 saw an increase of 12 shillings per pelt. It has been calculated that over 20 million beaver hats were exported from England alone from 1700 to 1770.<ref name="Carlos">Carlos</ref> Both trading partners, Native Americans, and Europeans, provided the other a comparative advantage in the fur trade industry. The [[opportunity cost]] of hunting beavers in Europe was extremely high: by the seventeenth and eighteenth centuries, the [[Eurasian beaver]] was near extinction in England and France.<ref name="Carlos"/> On the other hand, traders and trappers thought the wildlife in the New World was essentially limitless. Native Americans made use of the trade goods received, particularly knives, axes, and guns. The fur trade provided a stable source of income for many Native Americans until the mid-19th century when changing fashion trends in Europe and a decline in the beaver population in North America brought about a collapse in demand for fur.<ref name="Carlos"/>