What an investor needs is the ability to correctly evaluate selected businesses. Note that word โselectedโ: You don't have to be an expert on every company, or even many. You only have to be able to evaluate companies within your circle of competence. The size of that circle is not very important; knowing its boundaries, however, is vital.
Warren BuffettI mean, you know, you're not going to change the human animal. And the human animal really doesn't get a lot smarter.
Warren BuffettWhen a management with a reputation for brilliance tackles a business with a reputation for bad economics, it is the reputation of the business that remains intact.
Warren Buffett