The fate of the Trump administration -- and perhaps Republicans in Congress -- is tethered to how Americans feel about the economy. And right now, it's hard to find anyone who can say with confidence what the hell is going on.

Thursday offered a fresh reminder of the chaos. As The Wall Street Journal noted, "Stocks surrendered gains and closed sharply lower after a whirlwind day of trading that began after Nvidia posted strong results. The Nasdaq composite led indexes lower after being up on the day more than 2%. It closed 2.2% lower. Nvidia gave up an even bigger gain and finished the day down 3.2%."

Why the reversal? Because investors suspect there is, in fact, an artificial intelligence bubble.

It's not an unreasonable fear. History shows that every transformative technology -- from

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