Art of Selling #8: Know When the Party's Over — Kostolany's Egg 🔄

I had a client — sharp guy, ran his own business — who rode the 2021 meme stock wave beautifully. Bought GME at $40, watched it hit $300, and held all the way back down to $60. Not because he was greedy. Because he had no framework for recognizing that the market had entered what André Kostolany called Phase 3: the Excess phase. He thought the party had just started. It was already 2 AM.

Kostolany's egg isn't a fancy indicator. It's a map of how markets breathe — and more importantly, where the exit signs are.

The egg model traces a full market cycle through six phases. You want to be buying in Phase 1 (Correction) and selling as you enter Phase 3 (Excess). The transition into Phase 3 looks like this: interest rates have peaked or are starting to turn, inflation is cooling but GDP growth is still strong, and — most critically — sentiment has shifted from optimism to outright euphoria. Magazine covers feature stock picks. Your dentist is asking about options.

In concrete terms: by Q4 2021, the Fed hadn't raised rates yet but inflation was running hot at 6.8%, IPO volume had hit a 20-year high, and the ARKK ETF had tripled in 18 months. Every single one of those was a Phase 3 flare.

The Three-Signal Checklist

I don't sell on one signal. I wait for three to align:

Rate environment: Fed funds rate at cycle peak, or first cut already priced in by futures markets with 70%+ probability — meaning the 'easy money' era is acknowledged as over.

Valuation stretch: S&P 500 forward P/E above 22x, or your specific holding trading more than 40% above its 200-day moving average.

Sentiment extreme: AAII Bull-Bear spread above +30 for three consecutive weeks, or put/call ratio falling below 0.6.

When all three show up together, Kostolany's egg is telling you: Phase 3. Start trimming. Not panic-selling — trimming. I usually cut 30% of the position immediately, then another 30% if the signals hold for two more weeks.

Beginners use Kostolany's egg to confirm their existing bias. They're already holding a winner, the stock keeps going up, and they say 'well, we might not be in Phase 3 yet' — finding reasons to stay. I did this with Cisco in 1999. The egg was screaming Phase 3 for six months before the Nasdaq collapsed 78%. Confirmation bias is how a framework becomes a rearview mirror.

Force yourself to be a prosecutor, not a defense attorney. Look for evidence that you are in Phase 3, not evidence that you aren't.

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