In the cavernous basement of the Olympic Building, a line of boxy, dark brown delivery trucks rolls out to the early-morning streets of downtown Los Angeles, a chorus of tires squeaking across smooth concrete. Five floors up, in the UPS district president’s office, Noel Massie allows himself a brief moment of contentment as he feels the building vibrate around him and then fall still with the last of his fleet’s departures. This is the reassuring physical signal that his part of the never-ceasing, get-it-now economy has successfully turned one more notch on its endless loop — a cycle repeated at 2,000 similar United Parcel Service delivery hubs around the country and the world.