What is a current unsolved real world problemas that engineering could solve?

How did world war i contribute to the events leading up to world war ii? (a)germans wanted to expand their nation to regain territory in the soviet union. (b)britain and france wanted to force germany to make reparation payments. (c)germans hated the versailles treaty and supported hitler's actions to defy it. (d)the soviet union wanted to take over german territory in eastern europe.

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

Why do all market economies have taxes to support armed forces police forces public schools and at least some form of public transportation?