Solutions manual for recursive methods in economic dynamics by Claudio Irigoyen

By Claudio Irigoyen

Ideas guide to the vintage textbook Recursive equipment in financial Dynamics. The workouts within the e-book are indispensable to the textual content. This handbook presents targeted solutions to the issues in Recursive tools. Softcover.

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Note that Z s |f (υ(z)) − f (w(z))| dz |T υ(s) − T w(s)| ≤ Z0 s ≤ B |υ(z) − w(z)| dz 0 ≤ Bs kυ − wk . 36 3 / Mathematical Preliminaries Choose τ = β/B, where 0 < β < 1, then 0 ≤ s ≤ τ implies that Bs kυ − wk ≤ β kυ − wk . c. The fixed point is x ∈ C[0, τ ], such that Z s f [x(z)]dz. x(s) = c + 0 Hence, for 0 ≤ s, s0 ≤ τ , Z x(s) − x(s´) = s f [x(z)]dz s0 = f [x (ˆ z )](s − s´), Therefore for some zˆ ∈ [s, s0 ]. x(s) − x(s0 ) = f [x(ˆ z )]. s − s0 Let s0 → s, then zˆ → s, and so x0 (s) = f [x(s)].

G. Let f : [a, b] → R+ , and α < 0, then αf ≤ 0, which does not belong to the set of nonnegative functions on [a, b] . 3 a. Clearly, the absolute value is real valued and well defined on S × S. Take three different arbitrary integers x, y, z. The nonnegativity property holds trivially by the definition of absolute value. Also, ρ(x, y) = |x − y| = |y − x| = ρ(y, x) by the properties of the absolute value, so the commutative property holds. Finally, ρ(x, z) = |x − z| = |x − y + y − z| ≤ |x − y| + |y − z| = ρ(x, y) + ρ(y, z), 24 3 / Mathematical Preliminaries so the triangle inequality holds.

Xl ) ∈ S. ¯To show¯ that kxn − xk → 0 as n → ∞, note that kxm − xk ≤ l maxk ¯xkn − xk ¯ → 0 which completes the proof. 4b. 4c. are complete. The proof is the same as that outlined in the paragraph above, with the obvious modifications to the norm. 4d. is complete. Let {xn } be a Cauchy sequence, with xn ∈ S for all n. Note that xn is a bounded sequence and hence {xn } is a sequence of bounded sequences. Denote sequence xn . Then kxm − xn k = by xkn¯ the kth element ¯ ¯ of the bounded ¯ supk ¯¯xkm − xkn ¯¯ ≥ ¯xkm − xkn ¯ for all k.

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