Amazon uses a 'Two-Pizza Rule' to limit meeting sizes.

Jeff Bezos implemented the 'Two-Pizza Rule' during the early years of Amazon to maintain the company's agility as it scaled. The rule suggests that if a team cannot be fed by two large pizzas, the group is too big. This philosophy is rooted in the concept of 'social loafing,' a psychological phenomenon first studied by Max Ringelmann in 1913. Ringelmann discovered that as more people are added to a group, the individual productivity of each member actually decreases.Research from Harvard University and other institutions suggests that the ideal team size for complex tasks is between five and eight people. When groups exceed this size, the number of potential communication links between members grows exponentially. For a team of five, there are 10 unique connections, but a team of 10 has 45 connections. This 'link overload' leads to coordination problems and slows down decision-making processes significantly.By keeping teams small, Amazon minimizes the time spent on internal management and maximizes the time spent on innovation. Smaller groups foster a higher sense of individual responsibility because it is harder for a single person's lack of effort to go unnoticed. This lean organizational structure has been a cornerstone of Amazon's corporate culture since the early 2000s. It allows the company to remain decentralized and move much faster than traditional corporate giants.