I know that worrying about the deficit and debt is hopelessly retro, but please indulge me for a few minutes.

Last week the Congressional Budget Office issued its outlook for the next 10 years. The news was not good. Over the next decade, the annual federal deficit averages $1.2 trillion. It rises from 3.5% of gross domestic product in 2017 to 5.1% in 2027. The national debt, which is driven by annual deficits, rises from $15.7 trillion to $28.7 trillion over the same period, and surges from 78.0% to 96.2% as a share of GDP—the...