This is somewhat misleading and certainly not due to patriotism.<p>Car companies have massive discount plans for workers, friends and family, supply chain workers, previous customers, etc.<p>Detroit has lots of automotive industry workers, and thus for <i>many</i> people around Detroit, it's silly not to buy the car that you can get at a huge discount. This isn't necessarily an American vs non-American choice, since workers are typically eligible for a steep discount with only one car company.<p>Around the time that Japanese automakers began producing quality products, automotive execs in Detroit looked out their office windows and saw an increasing number of competitors' cars in the parking lot and it scared them. What kind of statement is it when a worker buys the competitor's product. So they offered steep discounts, which are pretty much guaranteed to result in workers buying their employers' product.<p>In more recent years, this has also been used to boost sales numbers in times of crisis. US automakers have had miles of unused tarmac near Detroit Metro airport filled with cars that they couldn't sell. At some point they just offer a steep employee discount and now a bunch of dud product that is losing money can be turned into a few months of strong sales. By using employee discounts for this, the firm is not seen to be succumbing to massive widespread discounting, and so the technique stays off the radar fairly effectively.<p>When you consider the cities that have automotive plants, supplier manufacturing plants, etc. and all the discounting going on in these areas, the chart starts to make a lot more sense.<p>Now for a small rant: Ironically, preventing workers from experiencing competitive products seems to have created tremendous myopia in Detroit and may be responsible for the decline of the US auto industry. Detroit is <i>still</i> using cheapo vinyl and plastic on midrange and even low end luxury cars, far inferior to the materials used on low trim-level Honda and Hyundai models.<p>One can imagine that if more workers had needed to think carefully about what they wanted to drive, the handwriting would have been on the wall and something could have been done about it before it was too late.<p>Note to business owners. If you have to discount your product by over 20% to get your own employees to buy it, take a closer look at what they prefer about your competitor's product.