 For example, when workers cannot move from one industry to another - perhaps because they do not have the right skills and cannot be trained, or do not live in the right place and cannot move - changes in the economy's comparative advantage will not shift them to a more appropriate industry, but rather to unemployment or precarious and unproductive jobs.Comparative advantage theory allows for a "static" and not a "dynamic" analysis of the economy.That is, it examines the facts at a single point in time and determines the best response to those facts at that point in time, given our productivity in various industries.