"And that's the trap of marginal thinking. You can see the immediate costs of investing, but it's really hard to accurately see the costs of not investing. When you decide that the upside of investing in the new product isn't substantial enough while you still have a perfectly acceptable existing product, you aren't taking into account a future in which somebody else brings the new product to market. You're assuming everything else--specifically, the money you make on the old product--will continue forever exactly as it has up until now. A company may not see any consequences of that decision for some time. It might not get "caught" in the short term if a competitor doesn't get ahead. But the company that makes all its decisions through this marginal-costs lens will, eventually, pay the price."