a) Incentives motivate people to do jobs better and faster than before. The best incentive for motivation is money. This is because people can use the money to buy things that they really want, instead of a general incentive that some people might not use or want.
b) One aesthetic experience I had was going to an Ed Sheeran concert. I went last year with my cousin and some of my friends. It affected me because I had a lot of fun and I felt more connected to his music and song lyrics after the concert.