Equation 13 · Part 1 · Selection Accounting: The Price Equation Runs the Economy
Symbol N_e
What this part means
the same headcount and wildly different.
Its job in the formula
is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol N_e→Article meaning
Where the article explains it
A hundred equal firms and one firm with half the market plus two hundred sharing the rest can have the same headcount and wildly different .
The passage around this formula
The paper checks this with a seeded simulation rather than leaving it asymptotic. A competitive industry of 400 comparably sized firms (HHI = 0.0031, 321 ) and a concentrated industry of 40 Zipf-distributed firms (HHI = 0.1006, 10 ) were each run through 20,000 replicate neutral periods with no selection whatsoever operating. A reading of half a log point of apparent “selection” — the kind of magnitude an…
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