← Every exhibit
The two-envelope test
Three rows, ten minutes, no meeting. Both answers get written before either side sees the other, which is the only version of this exercise that tells you anything.
Reference & Evidence
Source: Author's own worksheet.
Related exhibits
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Candidate shared numbers, and how each one fails
From the essay The one number a commercial team should share.
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The three numbers off your own cloud bill
From the essay What AI did to cost of goods sold is not visible in the line everyone quotes.
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The metric-definition worksheet
From the essay Gross margin is not contribution margin