An interesting WashPo piece on how Amazon and the USPS’s new move to deliver on Sundays further erodes the distinction between the work week and the weekend...

The tradition of a seventh day set aside for family and rest has been crumbling for years as states relaxed laws prohibiting gambling, shopping and even hunting on Sundays. The popularity of smartphones and the creation of an always-online culture has spurred greater demand — and ability — to have it all, right now, anytime.

Amazon’s move may not by itself be the most meaningful contributor to that phenomenon, but it is a contributor, and will probably lead to more such weekday-like activity…