In a see-saw motion, deals with at least one double-B rating fell from 39% of the total in September to just 15% last month while those with at least one triple-C rose to 33%, from 24%.
The United Parcel Service has for decades followed Taylor's time-and-motion theories to make its internal operations highly efficient, to the point of measuring the paces between a double-parked truck and a customer's doorstep.