Then why are the relative prices of manufactured goods falling? It is because manufacturing industries tend to have faster productivity growth than services. As the output of the manufcaturing sector increases faster than the output of the service sector, the prices of the manufactured goods relative to those of services fall. In manufacturing, where mechanization and the use of chemical processes are much easier, it is easier to raise productivity than in services. In contrast, by their very nature, many service activities are inherently impervious to productivity increase without diluting the quality of the product.