These three things are all true: The United States almost certainly isn’t in a recession right now. It may well avoid one for the foreseeable future. But the chances that the nation will fall into recession have increased sharply in the last two weeks.

That is the unmistakable message that global investors in the bond market are sending. Longer-term interest rates have plunged since the end of July — a shift that historically tends to predict slower growth, interest rate cuts from the Federal Reserve, and a heightened risk that the economy slips into outright contraction.

This is happening in an economy that, by most indicators, is solid. The United States economy is growing at a roughly 2 percent rate and keeps adding jobs at a healthy clip. There is no sign of the kind of huge, obvious bubbles that triggered the last two recessions, the equivalent of dot-com stocks in 2000 or housing in 2007.

So if there’s going to be a recession in 2020 — if the pessimistic signals in the financial markets prove correct — how would it happen? There are plenty of clues, in the details of recent economic reports, in signals from the markets, and in the recent history of recessions and near recessions.