I DON’T KNOW WHETHER Amazon is going to replace brick-and-mortar merchants, but I notice that I’m buying more and more stuff from them. And in a related development, my wife heard from a real-estate person that small commercial-office space is in a glut because a lot of people are running their businesses out of their home, given the ease of doing so that comes from the combination of Internet, cellphones, and UPS. I suspect that there’s more of this kind of thing going on under the radar.