European rearmament is usually measured through appropriations, orders, factory extensions, additional shifts and announced nameplate capacity. Those measures describe what goes into an industrial system, not the quantity of equipment that comes out of it in usable form. A production line can receive more capital, labour and material and still deliver less additional output than its nominal expansion implies, if a material share of the work has to be repeated, repaired, re-inspected or discarded. Conversely, a factory that raises the proportion of parts and assemblies meeting requirements on the first pass can release scarce machine hours and skilled labour without waiting for another building or machine to enter service. Manufacturing yield therefore belongs in the economics of European rearmament not as a quality-management detail but as the variable that connects industrial capacity, contract pricing, working capital and, ultimately, the quantity of conforming defence output that a given stock of resources can produce.