Why bombing a production bottleneck may not collapse industry

German fighter production is used to explain why damaging an industrial supply chain can constrain output. Ball bearings then illustrate two separate claims. The joke that they are merely steel balls depends on the opposite point: manufacturing them requires specialized skills and equipment. A further criticism questions the expectation that destroying bearing production would collapse the entire economy. Even an efficient component can have less efficient substitutes, so a bottleneck must be assessed alongside ways of working around it.