What fundamental economic concept underpins Vickrey's theory for optimizing road usage pricing?

Answer

Pricing scarce resources based on their marginal social cost

Vickrey articulated the core economic theory that underpins congestion pricing, which involves setting the toll equal to the marginal external cost of congestion to optimize traffic flow.

What fundamental economic concept underpins Vickrey's theory for optimizing road usage pricing?
inventionPricingtransportpolicycongestion