Your grandfather explains to you how to use his new multifunctional phone. you ask him where he learned to use his new phone but he cannot recall. trying his best, he can only tell you how it works. it is clear that your grandfather has limited

Memory

Explanation:

Grandfather cannot remember a lot of things and has a limited memory.

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.