Optimal Consumption And Portfolio Choice With Borrowing Constraints
Optimal Consumption And Portfolio Choice With Borrowing Constraints
Jean Luc Vila
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3) is uniformly elliptic and see Krylov (1987). ■ The next lemma says that the above sequence J' converges to J, as « goes to zero. Lemma 3. 3: J' converges to J locally uniformly as e goes to 0. Proof: See appendix B. ■ We next prove that the first and second derivatives of J* are bounded away from zero uniformly in e. This implies in particular that the optimal X in equation (3. 3) is bounded away from zero. Lemma 3. 4: In any interval [a, b], there exists two positive constants R, =R, ([a, b...]) and R2=R2([a, bJ) independent of (. , such that, for lVe[a, b], (i) J"(W)>R, (3. 4) (ii) \J'"{W} \ -tJLXV (W)} + max {u{c)-cV (^W)} -^rWyi^W) WG[a, b iifli - 2 ciO aR2 V{a)=J'(a), V{b)=J*{b) . (3. 6) 14 Applying classical results from the theory of elliptic differential equations (see, for example, Krylov (1987)), we get that (3. 6) has a smooth solution V which by uniqueness and lemma 3.
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