How is Truman's world paid for? What does everyone do during the show?

Truman's world is paid for by corporate advertising (commercials). During the show, everyone guides Truman in making decisions and living his life... keeping him in tune with the show.

Truman's world is paid for by corporate advertising. During the show, everyone in Truman's life is an actor. They all play their roles and keep the secret of Truman's world.