How did baldness go from acceptable to alarming?

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The mass marketing of anti-baldness products in the 20th century changed how baldness was seen. It transformed the perception of baldness from a benign aesthetic to a disadvantageous disease in need of “cure”.

Qn: 'People today are far too easily persuaded to spend money on things they don't need.' Do you agree that advertising has made us wasteful? (Cam. 'O' lvl 2022)