Small personal story: My father is an amazing salesman. He used to sell for Schwan's food in the 90's (those big yellow trucks that delivered frozen food to your door every 2 weeks). He had a blind couple (husband and wife) that were on one of his routes, and they bought a little bit of food every time he came by. But they could never read the menu, because Schwan's only had printed brochures. One day, he had me and…
- Force businesses/streets to add a curb lip for wheelchairs -> Stars above, suddenly it's easier to accept deliveries and bring in luggage!
- Optimize site for slow connections, suddenly you have a torrent of previously-unserved customers. [1]
Edit: Turns out it's called the Curb Cut Effect:
https://thingofthings.wordpress.com/2014/11/15/the-curb-cut-...
[1] Summary at this HN discussion, follow through to the story for more details. https://news.ycombinator.com/item?id=13601977