The Wall Street Journal has produced a video primer on recent supply chain stress. It is fifty-four minutes of well-researched, well- produced insight on sometimes hidden aspects of sociology and technology and their intersections. I have characterized supply chains as “socio-technical systems,” so I am sympathetic. The video is a great companion piece to Arriving Today: From Factory to Front Door by WSJ reporter Christopher Mims. This soon-to-be classic will appear again and again in classrooms nationwide. (And… the critical role of demand is referenced occasionally, but too easy to neglect along the way. Concentration effects are implicitly referenced (e.g., “ports” and “clusters”), but may not be obvious to many viewers. The focus is mostly on US domestic supply chains. This is mostly the story of shelf-stable flows. And, somehow, the producers are not aware of my argument (more and more) that not every instance of disequilibrium between demand and supply should be labeled a “shortage”. But in less than one hour we see and hear much that we really need to know.] Probably worth your time…