Competition is important because it gives the buyer a variety of choices, and the buyer can choose which is the best based on how well the buisness competes.
Competition is important for business because some people like another brand instead of your brand, so businesses like to up their game and make it so that if people had to choose which business to go to, they would choose yours. It's so that you stand out from other business or your competitors, and then the customers will almost always come to you. It also gives you ways to improve your business.
(I do not know where you wanted me to get the evidence from)
