The arrow labeled x is pointing to?

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

What is donald trump wanting to build and have finished by 2020?

Which of the principles do you feel is more important for our our american society? respond in 3 sentences. (principals: popular sovereignty, republicanism, federalism, separation of powers, checks and balances, limited government, or individual rights)