In the time diagram below, which concept is being depicted? 
Definitions:
Self-Sufficient
The ability of an individual or economy to meet all their needs without external assistance.
Exchange
The act of giving one thing and receiving another in return, often referring to the trading of goods, services, or currencies.
Economy
The method by which goods and services are produced, distributed, and consumed in a specific geographical area.
Specialization
The process of focusing effort and resources on a particular area of expertise or production to increase efficiency and output.
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