[yingw787]

If you restrict movement at all, you help reduce the amount of societal entropy. At a fine-grained level this is what China did, and it does work.

I'm worried about the U.S. closing state borders (land and air), and what that might mean for supply chains. I hope it doesn't come to that.

[SpicyLemonZest]

These border closures have almost universally had exemptions for shipping. So there may be secondary effects but it's unlikely to be disastrous.