Uber and Lyft have been struggling with a driver shortage, and Airbnb rates reflect surging demand for summer getaways and a shortage of available listings.部分原因是这些服务的需求猛增,各企业原本需要争夺顾客,现在却是客人多到应付不过来。优步和Lyft面临司机短缺的问题,Airbnb的房费标准反映了夏季短假...