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Rachleff’s Law of Startup Success

As explained in Tech Startup Toolkit

Rachleff's Law of Startup Success is a heuristic that says market quality dominates team quality in determining startup outcomes.

Rachleff’s Law says the market usually decides a startup’s fate. A great team cannot rescue a lousy market, while a great market can overcome a mediocre team. section 15.1.3

When the market disappears

Stacker and Netscape built products that became unnecessary when operating systems absorbed their functionality. Their products and teams could not compensate for a vanishing market; Borland and Lotus later followed. section 15.1.3

Use the law as a blunt startup check:

  • Treat lack of market as the number-one company-killer. section 15.1.3
  • Remember the qualification: a great market still assumes a basically competent team and an acceptable product. section 15.1.3

How Tech Startup Toolkit covers it

How deep it goes
Defines the heuristic, gives a market-collapse example, and adds a baseline-competence caveat without prescribing market-validation steps.
Examples
Uses Stacker, Netscape, Borland, and Lotus as examples of products undermined when operating systems removed their markets.
What you can do after
Evaluate startup prospects by asking whether a sufficiently strong market exists for the product.
How it connects
Connects market quality with startup success, product–market fit, team quality, and product acceptability.
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