Averaging Down

Averaging down is the losing-position behavior warned against in EP76 穿越1940：我与股票大作手利弗莫尔的最后对话. The source uses Jesse Livermore’s cotton trade and 1930 bottom-fishing failure to show how adding to a losing active trade can turn a bad thesis into a destructive portfolio event.

E153.股神的牌局：复利公式 + 凯利公式 adds that adding to a losing position should not be justified by lower price alone. For mature assets or broken ranges, the episode favors waiting for sufficiently improved payoff, new fundamental evidence, or a return to one’s identifiable edge rather than mechanically buying every decline.

Key Claims

• Averaging down can feel rational because the entry price improves, but the episode argues that the market is often showing the trader that the thesis or timing is wrong.
• Selling winners to fund losers compounds the mistake by keeping weak positions and removing strong ones.
• In leveraged or concentrated trading, loss averaging can turn small errors into catastrophic drawdowns.
• The source distinguishes this from systematic Passive Investing dollar-cost averaging, which is usually diversified, scheduled, and not based on defending one broken trade.
• The preferred alternative in the source is Stop-Loss Discipline plus Pyramiding into positions that have already moved favorably.
• E153 treats blind add-ons as a Position Sizing error because they increase exposure exactly when the original edge may be disappearing.

Connections

• Jesse Livermore — core cautionary case.
• Trend Following — framework that rejects adding while the trend is against the position.
• Pyramiding — opposite position-sizing rule.
• Investment Risk Management and Passive Investing — adjacent risk and implementation contexts.
• Kelly Criterion and Position Sizing — E153’s sizing-based warning against enlarging an invalidated trade.