Why Opinion?

Many things in society are influenced by public opinion. Companies renounce products, people buy bigger homes and faster cars, and city-states conquer one another just to prove something to the public or world, whether it be their monetary status, military supremacy, or marketing strategy. We all know it’s there; the question is, why? Why would someone try to impress peers, citizens, or even other nations.
Most people want to be wanted. In order to be wanted, they need approval from other people. Approval is gained by improving the way others think about you.