(You could make a VERY long list if you included underserved demographics which did not also have huge purchasing power, but in terms of business models, I'd rather be targeting 40 year old American women with graduate degrees and household income in the $80k+ region than illiterate folks in Africa whose most reliable web access is a shared cellphone.)
Women.
Old people. i.e. those above the age of 30
People who do not like using computers.
People who are not Americans.
People who do not read English.
(You could make a VERY long list if you included underserved demographics which did not also have huge purchasing power, but in terms of business models, I'd rather be targeting 40 year old American women with graduate degrees and household income in the $80k+ region than illiterate folks in Africa whose most reliable web access is a shared cellphone.)