Common mistake number ten: Talking and not listening The old saying, "two ears and one mouth" is true. Listen to what people have to say, there is a value in everyone's opinion or thoughts. It's your staff that are on the front line, they speak with customers every day, they interact. They understand the customers far better than you ever will. Listen to them; engage your staff in forums. Understand your customers; let your staff contribute to your business. Staff will add more value to your business or company than your accountant will.