Global Attractivity of Neoclassical Models With Sublinear Ricker‐Gamma Growth Rates and Variable Time‐Lags

ABSTRACT In this paper, the problem of global attractivity of a neoclassical model with sublinear Ricker‐type Cobb‐Douglas growth function and variable time‐lag in the production function is investigated. By novel comparison techniques based on the fluctuation lemma and differential inequalities, the permanence property of positive solutions and global convergence to a unique positive equilibrium are established. The obtained results encompass existing ones in the literature as some special cases.