This paper presents a theoretical model in which the stock growth rate of durable goods has stochastic fluctuation over time. It concludes that a social planner increases the expected percentage rate of production since uncertainty increases the user cost from consumer’s point view.

A study was conducted to assess the durable resistance in a near isogenic line of spring wheat (Triticum aestivalis L.), possessing resistance gene Yr-18 to some isolates (race specific resistance) of stripe rust (Puccinia striiformis f. sp. tritici), namely Thatcher Yr-18 and durable resistance of an cultivar of spring wheat to all isolates of stripe rust (race non- specific resistance), namel...