Why Last Week's Market Sell-Off Was a Good Thing

The S&P 500 plunged 4.4% on November 5, 2026, erasing $3.7 trillion in market value before rebounding the following day. Two catalysts drove the move: stretched valuations, with the Shiller P/E ratio at 41, and worries that Democratic policies could hinder AI data-center development.

The Motley Fool's author calls the drop healthy, likening it to small forest fires that prevent larger ones. The argument: a sharp reset in overextended valuations clears froth and creates entry points for buyers rather than signaling a regime change. The one-day rebound gives that view some early support, though a single session proves little.

The article also points to seasonal history. The six months following midterm elections have historically been positive for stocks. That is a base-rate argument, not a guarantee, and it sits against a valuation backdrop that remains elevated at a Shiller P/E of 41.

Interpretation: with ONEQ tracking a broad Nasdaq-listed universe, the AI data-center policy worry is the sort of headline risk that can hit growth-heavy benchmarks hard, though the source does not quantify any ONEQ move.