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Group Behaviourism

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Group Behaviourism

Stocks within an industry sector tend to move together. In a bull market, all members of a group should advance. When one member of a group conspicuously fails to advance while its peers rise, the divergence is a diagnostic warning, not a buying opportunity.

The Principle

"I never buy a stock even in a bull market if it doesn't act as it ought to act in that kind of market."

The logic: if general conditions are favorable for an industry, insiders — management, directors, large shareholders — know this and will act accordingly. They will buy their own stock, or at minimum not sell it. If a stock lags persistently while its group leads, insiders either (a) haven't accumulated yet (possible but inconsistent if the bull is mature), or more dangerously (b) are not buying because they know something the public doesn't.

The Diagnostic Steps

  1. Identify the group leader — which stock in the sector is most active and leading the advance?
  2. Check the laggard — is any member of the group declining or flat while the rest rise?
  3. Test the market — sell a small amount of the laggard. Watch how the market absorbs it:
    • If selling moves the price down sharply on small volume: no buying power → insiders are not there
    • If selling is absorbed easily: possibly the lag is temporary
  4. Look for inside behavior — is management buying on the decline? If not, the diagnostic is confirmed
  5. Act on the pattern, not the reason — you don't need to know why insiders aren't buying. The fact that they aren't is enough.

"I didn't have to know why the insiders did not think enough of their own stock to buy it on the decline. It was enough that their market plans plainly did not include further manipulation for the rise."

The Chester Motors Case

In a roaring bull market with automobile stocks (fictionalised as Blackwood, Chester), Chester lagged while Blackwood led. The public, tipped by wiseacres, bought Chester expecting it to "catch up." Instead it declined.

Livermore's read:

  • If insiders weren't putting it up, two possibilities: (a) still accumulating (but volume analysis made this implausible), or (b) afraid to buy because they knew something bad
  • He sold Chester short
  • Stock eventually broke wide open; barren financial news was later confirmed
  • But Livermore had acted weeks before, from behavior alone

"The tape warned me... I looked for one sign: inside buying. There wasn't any."

The Guiana Gold Case

Same pattern. A syndicate pool created on a mining stock, sold heavily to the public up to 47. Gold group was strong. But Guiana began sagging 10 points. Livermore:

  • Tested with a small sell → price dropped, taken in driblets
  • Sold more → price continued lower
  • Covered before news arrived confirming the property was striking barren rock

The pool had done something structurally self-defeating: sold 250k shares to their own banking partners at 36, then distributed ~400k shares to the public up to 47. Once distribution was complete, the only remaining holders were outsiders who would sell to other outsiders — no floor.

Why Groups Move Together

All stocks in an industry share general conditions: commodity prices, interest rates, regulation, consumer demand. A management team in an industry knows its own fortunes and those of its major competitors. If prospects are genuinely good, insiders throughout the group will be buyers. The group thus tends to move together when real economic forces drive it — and when a member diverges from the group, the most probable explanation is that it faces a specific problem rather than enjoying a specific edge.

What "Inside Buying" Means

Livermore's proxy for insider conviction was simply: are they buying their own stock on weakness in a bull market? If not, their market plans do not include a further rise — and without insider support, there is no pool floor, no demand for large blocks, and any bad news will find the stock with no cushion.

The absence of insider buying is more actionable than the presence of bad news. News explains past behavior. Insider absence predicts future behavior.

Relationship to Pool Operations

The group-behaviourism signal is strongest when a pool has recently completed distribution. Once the pool has sold its position, it has no incentive to hold prices up. Livermore understood that when public ownership of a stock exceeded the pool's remaining interest, the stock's float consisted of outsiders selling to outsiders — a structurally weak situation. See market-manipulation for pool mechanics.

Related Concepts

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