In this case Buffer is also a result of selection bias, since you do not have data on more private companies. I'm also skeptical of the attribution of Buffer's

In this case Buffer is also a result of selection bias, since you do not have data on more private companies. I'm also skeptical of the attribution of Buffer's success to their openness; Buffer is successful first and foremost because it's a good product that works and was released at an opportune time. The fact that they are an "open company" is likely, at best, a small marketing advantage.