Traditionally Companies had about 100 men (In Roman Times they were called Centuries for their contained about 100 men). Since WWI, the number of people in a Company has increased, but you also saw a greater use of Platoons (the next smallest group within the Military hierarchy) with the Company becoming more and more where the higher ranks of the Platoon meet to co-ordinate their platoon actions with the other platoons and the various support groups retained at company headquarters.
Thus you have about 100 men working together to keep the various smaller groups working toward the same goal. As you go up the chain of Command, the number of about 100 keeps coming back, as BOTH the people supporting the people coordinating the groups below and above them. For example the level above Company is the Battalion, which has a Headquarter Company. That headquarter company feeds itself, provides its own security etc while coordinating the actions of the various line companies in the battalion (and works with the Support Company to make sure the other company gets their food, ammunition, medical care, and heavy weapons support, i.e. Mortars, AA protection and other heavy weapons support).
At the next level, the brigade (Prior to 1964 in the US Army this was called a Regiment) again you have a Headquarters's company to coordinate the various line Battalions, any attached artillery battalion (and it various Batteries, what the Artillery call its Companies) along with Air Support, supply, Front line Hospital care etc.
I point this out for all of society tends to be this way, groups of 100 or so people working with each other to get things done, but the 100 people each person works with MAY be a different set of 100 people. Some may be in Platoon level, some may be in Company level some may be at Battalion level some may be at Bridge or even higher level. Some of these groups are formal, such a Military Company, some may be known and formal but not actually named, the officers of the various groups working together for example from Division, excluding company level officers, my have only about 100 men (4 Officers per company, four companies per battalion total 16 Company level officers plus Battalion officers of another 14-16 officers, total 30 officers but only 3 or 4 Major or above and lower ranking staff officers as opposed to line officers.
Thus while the total officers in a Brigade (Generally three Battalions to a Brigade) may be around 100, those actually working at the Brigade level generally are less then a third of that number (The rest in charge of Companies or Platoons). Thus the number of officers interacting at the Division level (Which generally consist of three brigades) again of about 100 people. Each level represents another 100 or so people interacting, till we get to the various wings of the Pentagon.
Business organization tend to be about the same, about 100 people interacting. If you have more then that you have to break it up into smaller pieces to keep the number of people below about 100. In many ways, the 1% tend to be the people in charge of this interaction. If done fairly works out well, if done unfairly (i.e. the 1% get to much of the profit of getting the groups to work together) the groups break up (or revolt and replace their part of the 1%).
Just pointing who why 100 tends to be almost universal AND where the 1% operate among those groups of 100.
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