Yashica started their photographic line of products with a Twin Lens Reflex camera that was manufactured for another company. Once the decision was made to prduce cameras under their own brand name, they created a family of them to span the needs of, and within the price points suitable for, a number of buyers.
The mother of invention
There are hundreds of reasons to start a business, but at some point in time a direction is needed to guide the company's future. Unless you are in the unique position as the only producer of your product or service, part of the decision is in whether you'll be a leader or a follower.