Hurt is something you feel right sorta of like after a break up but not quit

Give an example of a situation in which an individual's pursuit of economic self-interest may not benefit but instead harm the rest of society

Toward the end of the roman empire, what caused a decrease in the use of coined money tell me now

Are people more motivated to change from positive or negative experiences, like slavery, womens rights, and any other historical movements/moments? i need more factual information than opinions.