Contrary to the assumption of perfectly flexible labor markets commonly used in mainstream macroeconomic models, in the real world the existence of structural imperfections such as search and trading costs hinder the frictionless functioning of these markets, generally leading to outcomes of Non-Walrasian type with involuntary unemployment and open vacancies in "equilibrium". In this paper we model the existence of labor market frictions into a Keynesian (Disequilibrium) AS-AD framework in the line of Asada, Chen, Chiarella and Flaschel (2006) through a labor search and matching function. By means of dynamic shock simulations, we find that the extent of the labor market rigidity has a great importance for the dynamics not only of employment and output, but also of wage and price inflation, and consequently also for the conduction of monetary policy.-------