10. give an example of how the wealthy can benefit a mass of people rather than just a few. (according to carnegie)

Charity is the answer because Andrew Carnegie explains it in the "Gospel of Truth" saying  "In bestowing charity, the main consideration should be to help those who will help themselves" and also explaining "the man of wealth thus becoming the mere agent and trustee for his poorer brethren…." this here explains that he wants or believes the rich should help and aid the poor for the better of the community.

where is the picture