Note on positive lower bound of capital in the stochastic growth model

Partha Chatterjee and Malik Shukayev ()

Journal of Economic Dynamics and Control, 2008, vol. 32, issue 7, 2137-2147

Abstract: In the context of the classical stochastic growth model, we provide a simple proof that the optimal capital sequence is strictly bounded away from zero whenever the initial capital is strictly positive. We assume that the utility function is bounded below and the shocks affecting output are bounded. However, the proof does not require an interval shock space, thus, admitting both discrete and continuous shocks. Further, we allow for finite marginal product at zero capital. Finally, we use our result to show that any optimal capital sequence converges globally to a unique invariant distribution, which is bounded away from zero.

Date: 2008
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