A continental shelf along a passive margin is below sea level because: 
Definitions:
Barter
An exchange system where goods and services are traded directly without the use of money as a medium.
Adam Smith
was an 18th-century Scottish economist and philosopher, best known for his works on the principles of free market economies.
Scottish Professor
Refers to academics from Scotland, particularly notable in areas such as philosophy, economics, and history, though not a specific individual or designation.
Invisible Hand
A term coined by Adam Smith to describe the self-regulating nature of the marketplace, where individuals' pursuit of their own interest leads to economic benefits for society as a whole.
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