Bloc power is a major reason why collective bargaining (unionization) is such a big deal. The Brownian motion of individually unimportant workers joining and leaving a company has a minimal effect on the business. There will be good days and bad for the company due to these small fluctuations but, on the whole, an individual’s vote (whether to work or quit) is meaningless amid the noise. The low-level worker has no real vote. Collective bargaining, on the other hand, can be powerful: a large group voting against its management (a strike) at the same time can have a real impact.