Assumed Scalability Fallacy

One of the FallaciousArguments, wherein it is asserted that because a system (political, technical, economic, whatever) works with small groups, datasets, etc., that it will work equally well with large ones. Often used in the context where the system being advocated is "clean", "simple", "elegant", etc... and is being suggested as a replacement for an existing large-scale system which is full of warts and compromises.

Examples, from various disciplines:

This fallacy often works in reverse:

Compare with SlipperySlope


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