How early an industry went online may be a good proxy for how much competitive pressure it faces. For instance, retail went online early in the history of the Web, but parts of the medical industry are still doing a lot of work on the phone/fax.
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What businesses still don’t have much online presence? Hairstylists? Dry cleaners (basically you go to the closest one)?
Hairstylists have apps with ratings. Dry cleaners afaik have no online presence besides yelp.
