The claim that socialism and communism are outdated ideologies from the 19th century, while capitalism is presented as timeless, natural, and permanently relevant—despite capitalism also being a 19th-century ideology that has changed dramatically over time. This fallacy arbitrarily declares one set of ideas expired while granting another eternal freshness, based on nothing but preference. It's like saying horses are outdated but cars are forever, ignoring that cars will also be obsolete someday, and that the criteria for "outdated" are entirely made up. The arbitrary obsolescence fallacy allows capitalism's defenders to avoid engaging with socialist critiques by simply declaring them old, as if age determined validity rather than, you know, evidence and argument.
*Example: "In the debate, he deployed the arbitrary obsolescence fallacy: 'Socialism is a 19th-century idea that failed everywhere it was tried. Capitalism is modern, dynamic, the future.' She pointed out that capitalism was also a 19th-century idea, that it had also failed many people, and that 'modern' was just a vibe, not an argument. He responded with 'but look at the stock market.' The fallacy held strong."*
by Dumu The Void February 15, 2026
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by QuacksO December 20, 2025
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by DannyNoonan89 February 24, 2019
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