Fast-fashion wars are warmup for Amazon battle

HONG KONG, Aug 1 (Reuters Breakingviews) – An intensifying fast-fashion rivalry in the United States offers a glimpse of the bigger battles to come. E-commerce app Temu is taking on the larger Shein by selling cheap Chinese-made goods to Western consumers. The company owned by $119 billion PDD (PDD.O) is more like an online dollar store. That puts it on a collision course with $1.4 trillion Amazon (AMZN.O). At first glance the competing smartphone apps look similar. Both have used speedy product development and supply chains in China to win over young American shoppers with bargains like $5 shirts. The…