!!! Overview
[{$pagename}] is a series of numbers that define a [group] ([Society], [Social network] or a [Community of Interest]) sizes that increase by about a factor of three:
* 5 - [clique]
* 15 - [sympathy group]
* 50 - [hunter-gather]
* 150 - [friends] (Also [Social network] limit
** An Army Company: 180
** Amish Parishes: 113
** Christmas Card Networks: 150
* 500 - [megaband]
* 1,500 - [tribe]

Robin Dunbar implied these limitations are based on the size of the brain.

These [groups] are sizes within different levels of [Relationships].

We have also seen that groups of less than [sympathy group] referred to as the [Creative Network].

!! [{$pagename}] and [Social contract]
As a Social size moves from a smaller [Group] to a larger group, the existing [Social contract] begins to fail. As sizes exceed [Friends] [Group] (150) suggests that any [Community of Interest] will not survive unless it is highly incentivized to remain together.


!! [{$pagename}] What is the takeaway?
The [Social contract] failure is due to a [Human Limitation] of how many [persons] an [Individual] can have [relationships] involving [trust] and [Responsibility]

Dunbar's study further showed that, one can: 
* have a close relationship with a group of about 5 people
* share a level of deep [trust] with around 15
* have a meaningful [relationship|relationships] with around 50 
* and an active contact, stay in touch at least once a year, with about 150 people


!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Dunbar's number|Wikipedia:Dunbar%27s_number|target='_blank'] - based on information obtained 2018-05-02- 
* [#2] - [The Dunbar Number as a Limit to Group Sizes|http://www.lifewithalacrity.com/2004/03/the_dunbar_numb.html|target='_blank'] - based on information obtained 2018-05-02-