Income Taxation when Markets are Incomplete



Income taxation when markets are incomplete

127


(for any finite B). The asset market clearing condition, together with the
no-short sell conditions, imply that
θr |θ*| < ∞ is a subsequence
of
r). Then, Assumption 2(2), and the spot market clearing conditions,
imply that individual demands have subsequences
(xr) → |x*| < ∞ such
that (2) holds. Since the utility function is twice continuously differentiable,
Du (xr) → |Du (x*) | (for any finite A). This also implies that r) →
|λ*| < ∞, and thus (1) is satisfied. The last condition - together with the
fact that
θr is bounded - implies that βr also converges to a finite bounded
entity. Then, note that, by definition of
T', (t1 r) is always bounded. The
above facts imply that for every firm the Lagrange multiplier
υr is such that
υr → |υ*| < ∞ and (4) holds. Moreover, the above facts, and (3) and (7)
respectively, also imply that there exist subsequences
qr → |q*| < ∞, and
(t0r) → 110| < ∞. This completes the proof. □

References

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Cass, D., Citanna, A. (1998): Pareto improving financial innovation in incomplete markets.
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Citanna, A., Kajii, A., Villanacci, A. (1998): Constrained suboptimality in incomplete mar-
kets: a general approach and two applications.
Economic Theory 11, 495-521

Citanna, A., Polemarchakis, H.M., Tirelli, M. (2001): The taxation of trades in assets. Work-
ing Paper No. 01-21. Department of Economics, Brown University, Providence, RI

De Marzo, P. (1988): An extension of the Modigliani-Miller theorem to stochastic economies
with incomplete markets and independent securities.
Journal of Economic Theory 45,
353-369

Diamond, P.A. (1967): The role of a stock market in a general equilibrium model with
technological uncertainty.
American Economic Review 57, 759-776

Diamond, P.A., Mirrlees, J.A. (1992): Optimal taxation of identical consumers when markets
are incomplete. In: Dasgupta, P. et al. (eds.): Economic analysis of markets and games:
essays in honor of Frank Hahn. MIT Press, Cambridge, MA, pp. 561-581

Dierker, E., Dierker, H., Grodal, B. (1999): Incomplete markets and the firm. Paper 9902.
Department of Economics, University of Vienna, Vienna

Drèze, J.H. (1987): Investmentunderprivateownership: optimality, equilibrium and stability.
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Elul, R. (1995): Welfare effects of financial innovation in incomplete markets economies
with several consumption goods.
Journal of Economic Theory 65, 43-78

Elul, R. (1999): Welfare-improving financial innovation with a single good. Economic Theory
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Feldstein, M. (1976): On the theory of tax reform. Journal of Public Economics 6, 77-104



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