Hmm, When people are wasting products and resources are idle. I think they have enough. Example, if a person has five cars two houses and three boats. Seriously unless you are laoning those items out to others I would say that is more than enough. Ok that may be over the top, but I am sure you get the point.
Food, water, air, shelter, peace of bing, spiritual growth these are the basic needs. All other things are wants. Once a person has their needs met, technically speaking that is enough. When a person have things just to say they have it or just to show, they have too much.