Is scarcity an idea that is powerful enough to fix our email overload problems?
There is no scarcity with email. With no scarcity, there is no discipline. And with no discipline, there's bad behavior–and tons of email.
Economists commonly refer to this problem–where the lack of scarcity pits individual interests against the common good–as the "tragedy of the commons"
I think a better solution would be if everyone could set their own price for receiving email. That would make the sender think more about whether or not the message is really so important.