The United States, of course, is not Australia and has a customer base that is hard to ignore.  Marketplaces will likely continue to deliver, despite higher costs, but will pass along these higher postal rates to customers who will pay more. In the meantime, firms will search for alternative markets outside the US to continue to grow their businesses. Governments outside the United States may follow suit and withdraw from the UPU as well, leaving US exporters, including many of the most vibrant global e-commerce vendors, at risk of failing to reach their own customers in fast-growing overseas markets where last mile delivery is always the most challenging part of e-commerce for firms. Withdrawing the United States from the UPU may seem like a small victory for Trump, but the implications and collateral damage it could cause to American consumers and companies alike may be significantly more than the relatively minor amount Trump claims the US Postal service is currently forgoing.