The Twain Audit

Any investor considering a concentrated position.

Before you add to the position, write down three operational metrics that would tell you the business is failing. Not stock price. Not market sentiment. Not analyst ratings. Metrics you can observe in the business itself: same-store sales growth, customer acquisition cost trend, employee attrition in key departments, unit economics by cohort. If you cannot identify three such metrics without looking them up, you are Twain, not Carnegie. You are watching a basket you cannot evaluate. The test has a second part: for each metric, write down the specific threshold below which you would sell. Not "if it gets bad" but "if customer retention drops below 85% for two consecutive quarters." If you cannot specify thresholds, your "conviction" is emotional attachment wearing analytical costume. Twain watched the Paige Compositor for fourteen years with intense conviction and zero evaluative capacity. Carnegie could quote steel costs to the hundredth of a cent. The difference between those two forms of attention was everything.

Any founder doubling down on a failing strategy.

Write down the three signals that would tell you the strategy has failed. Be concrete: not "if the market shifts" but "if our conversion rate from trial to paid drops below 4% for three months" or "if our top three enterprise prospects all decline in the same quarter." Now ask yourself: would I actually exit if those signals appeared, or would I find a reason to explain them away? If the honest answer is "I would explain them away," the Twain Audit has revealed something important: your attachment to the strategy is not analytical. It is identity. And identity-driven attachment does not respond to evidence. Twain believed he would know failure when he saw it. What he saw was bankruptcy, and he did not recognize it until the money was gone.