This study investigates worker productivity in a multiple-task environment. We consider workers with the same education level while their suitability patterns for tasks differ. Under no change in tasks for which they are responsible for, there is no difference in their productivity. If...

This paper presents a model of technical change that combines two lines of research together. It is a task based model, in which automation turns labor tasks to mechanized ones, and there is also a continuous addition of new labor tasks, as in the expanding variety literature. We impose three...