Forbes lists several top-performing small businesses that have had great endurance for the past ten years. Some of the industries represented include wallboard manufacturing, building material manufacturing, electronics stores, prefab housing, and automobile parts. No, these industries don't sound very exciting. But typically it's these mundane categories of businesses that produce wealth for their owners. Often dull-normal industries don't attract a great deal of competition, and demand for their offerings is not usually subject to rapid downturns. We