Coefficient Giving's @mattsclancy explains why America's 20-year per-capita economic growth has fallen from roughly 60% to 30%, and what housing, energy, and medicine have to do with it: "It’s just become a lot harder to build new houses in America, especially in big cities where you can enjoy agglomeration benefits that have these spillovers for economic growth and innovation." "We’ve invented new kinds of energy generation, but it doesn’t affect anything until you can build it and get it out there on the grid. We invent new drugs, but it takes a really long time to get them approved and out." "On the other side, the engine of scientific progress faces headwinds. The ecosystems that support it have to adapt to overcome things like the burden of knowledge that makes it just harder to make advances with the same amount of resources." @coeff_giving