ZMP
Tyler Cowen and other semi-conservative economists are flogging the notion that the unemployed are unemployed because they aren't worth their keep - that they aren't being hired because they can't produce enough value for it to be worthwhile for an employer to hire them. Economically speaking, they can produce only zero marginal product. The advent of the automobile caused the transportation value of the horse to drop below the value of the cost of maintaining him, so a lot of formerly useful horses earned a ticket to the glue factory. Is that the designated fate of the American unemployed, metaphorically anyway? Paul Krugman and other Keynesians maintain that the actual problem is insufficient aggregate demand - there just aren't enough people willing and able to buy stuff. At one level, both explanations are almost tautologically true. Given large enough demand, everyone would be hired. If employers were convinced the hiring someone would produce a profit for th...