The $1-trillion infrastructure deal between Congressional Democrats and Republicans may at least help us answer the question: What is infrastructure? Economic definitions, when you can find them, are not enlightening. They often provide a mere list of what are supposed to be instances infrastructure without providing a key to their common features. Criticizing the infrastructure deal, a Wall Street Journal editorial provides a list of its own of “traditional public works” (“A Not So Grand Infrastructure Deal,” July 29, 2021):...