You'll remember that we found trade documents from the Indus Valley civilization all the way in Mesopotamia. But for a few reasons, the scale of this trade has increased dramatically. One, multinational corporations have global reach and increasing power. Two, travel and shipping are cheap and safe. It took about two months to cross the Atlantic in 1800. Today, it takes about five hours by plane and less than a week by ship. Three, governments have decreased tariffs and regulations on international trade, leading to what is sometimes called, euphemistically, free trade.