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I disagree with your logic. Small, technically trivial but conceptually polished tweaks can add up to a difference that takes over the market. For example, everybody used to clean their hair with soap, then somebody decided to sell it in liquid form with pretty scents, and now you always buy "shampoo".

Medium can have the same key ingredients as Blogger and still replace it.

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That's not true, bar soap gets stuck in hair and doesn't rinse well. Look at the ingredients in soap vs shampoo.

I have. Formulas for both have of course changed over the years, but the way in which they work has not.

Both have also become more tailored for their use case. For example, shampoos sell better if they create a pleasant lather, and soaps if they also moisturize your skin. Those additives are why a modern bar of soap might not work well in your hair. But pure soap does, and so do some modern soap bars.

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