@RondoInBFlat, he can’t, because the numbers don’t really support his assertion.
For example, the researchers in the PhD paper used hypothetical tenure standards of 1 and 0.6 AER-equivalent papers (with publication in various lesser journals being worth fractions of getting a paper published in the American Economic Review or Econometrica).
Let’s say that to get tenure at a pretty good (not tip-top) research university in econ, you need .75 AER-equivalent papers. Over 20% of the econ PhDs from MIT, Princeton, Rochester, CMU, and nearly 20% of the econ PhDs from Northwestern and UCSD meet that standard. Less than 5% from Cornell, OSU, UMD, UT-Austin, UIUC, UC-Davis, USC, BU, PSU, (and non-top-30 econ PhD programs) do.
Let’s say that to get tenure at any university, you need .25 AER-equivalent papers. At no school does the majority of the econ PhD students meet that standard, but over of a third of the PhD students at MIT, Princeton, Rochester, UBC, UCSD, CMU and almost a third of Northwestern & Harvard PhDs achieve that standard. Less than 10% of econ PhD students at OSU, UMD, UT-Austin, UIUC, USC, BU, (and non-top-30 econ PhD programs) do.
When you take in to account that a decent number of econ PhDs don’t head in to academia (and the ones from better schools generally have better opportunities in industry), Gladwell’s assertion that the distribution is the same at all schools really falls apart under scrutiny.