Proof of Proposition 6: Since we know from (A.21) that ∆ < 0, it follows directly
from (A.22) that condition (4.8) in Proposition 6 is necessary and sufficient to
ensure that dW - dw > 0. ¥
Proof of Proposition 7: Inserting (A.18) and (A.19) into (A.31), one finds the
following welfare effect of a further coordinated increase in the capital tax rate
at the point where the recruitment constraint just ceases to bind (so that we still
have ug = up and u0g = u0p = u0 initially):
—---"^ʌ) fdSW^) = Yσc (α + δ) . — (1 — α)
yu0ε (1 — α) ) y dτ ) |_a + αδ
α + δ α2 + δ
- δ + α (2 — α) + ( j ( —∩----г j (A.34)
1+δ α (1 — α)
Since ∆< 0 according to (A.21), it follows directly from (A.34) that the con-
dition (4.9) stated in Proposition 7 is necessary and sufficient to guarantee that
dSW∕dτ > 0. ¥
39
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