Related: Some “Top Charity Ideas” by Charity Entrepreneurship: https://forum.effectivealtruism.org/posts/ykwQCpBxL3qPKAAqx/top-charity-ideas-2019-charity-entrepreneurship
An old LessWrong thread on startup ideas: https://www.lesswrong.com/posts/YbCc3NRrr5avvWSHT/who-wants-to-start-an-important-startup
There’s also this post plus comments.
Related: Some “Top Charity Ideas” by Charity Entrepreneurship: https://forum.effectivealtruism.org/posts/ykwQCpBxL3qPKAAqx/top-charity-ideas-2019-charity-entrepreneurship
An old LessWrong thread on startup ideas: https://www.lesswrong.com/posts/YbCc3NRrr5avvWSHT/who-wants-to-start-an-important-startup
There’s also this post plus comments.