The boundary between these two different sedimentary layers is: 
Definitions:
Own Interests
Actions or decisions driven by personal benefits or gains, often discussed in the context of economic behavior or political decision-making.
Public Interest
The well-being and general benefit of the community or society at large, often guiding government policy and legal decisions.
Adam Smith
An 18th-century Scottish economist and philosopher known as the father of modern economics, famous for his work "The Wealth of Nations."
Modern Economics
A branch of social science that studies how individuals, businesses, and governments make choices on allocating resources to satisfy their needs and wants.
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