Accounting for almost 30% of world GDP, the United States is the world’s largest and most demanding market for almost everything from oil to microprocessors to premium coffee. Companies around the world aspire to do business in the US, or at least with US companies in their home markets. By doing so, they learn much about the latest management practices, they can be closer to the cutting edge of innovation, and they can boost their reputations by supplying well-known US firms.