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(A) PLACEBO: community penetration and the income of never-online
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  non-user sample n=1165
  iv_comm -> ln_income: b=+0.0802 (SE=0.1379, p=0.561)

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(B) 2SLS with leave-one-out community mean log income as control
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  baseline 2SLS      : internet b=+1.0372 (SE=0.2532, p=0.000)  1st-stage F=  82.9
  + comm mean ln_inc : internet b=+0.5482 (SE=0.2461, p=0.026)  1st-stage F=  79.0

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(C) POOLED INTERACTIONS with SEs (cluster commid)
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  Learning x Female            b=+0.2047 (SE=0.0482, p=0.000)
  Learning x Older(46-60)      b=+0.1732 (SE=0.0559, p=0.002)
  Learning x Rural             b=-0.0210 (SE=0.0532, p=0.693)
  Internet x Urban             b=+0.0696 (SE=0.0572, p=0.224)
  Internet x Male              b=-0.0706 (SE=0.0581, p=0.224)
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