Building waves ...
  2018: n=9086, internet rate=76.2%
  2020: n=7845, internet rate=84.3%

Individuals with valid income in BOTH waves: 4480
  Internet-status switchers: 655 (14.6%)  [adopt=426, drop=229]
  -> FE internet coefficient is identified off these 655 switchers.

(1) Pooled OLS (both waves, year dummy, entity-clustered):
    internet b=+0.1254*** (SE=0.0194, p=0.000)  ~+13.4%

(2) Individual FE + year FE (within estimator, entity-clustered):
    internet b=-0.0021 (SE=0.0623, p=0.973)  ~-0.2%
    N obs=16931, entities=12451.0, within R²=0.0007

(3) First-difference (2020-2018):
    Δinternet b=-0.0017 (SE=0.0321, p=0.957)  ~-0.2%, n=4480

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SUMMARY: pooled cross-section ≈ +10–11% (matches single-wave paper);
the within-individual FE estimate is the credibility upgrade.
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