Human Action Ultimately Comes Down to the Role of a Linker

Human action —
and human action ultimately comes down to the role of a linker.
That link sometimes takes the form of a tool (tangible) and sometimes an organization (intangible).
And those linkers gradually become more specialized and also more interdependent.

Being interdependent
ultimately means that from the perspective of total mass, things are conserved.

For example,
suppose there is agriculture and an automobile industry.
At first, they are both vaguely defined industries. About 10 people / 10 people?
As time passes, after 10 years,
agriculture segments into organic, vegetables, fruits, greens, etc.
The automobile industry also segments into SUV, compact, large, mid-size.. becoming increasingly specialized.
The problem is that during those 10 years, the accumulated workers and sub-industries
have grown far beyond the original scope, creating complex interdependencies.