Imagine a world where AI and robots have taken over all tasks, from farming and manufacturing to transportation and medical diagnosis. Material wealth is vastly abundant, and daily necessities are nearly free. In such a "post-scarcity era," does the "currency" as we know it today still hold any significance? The birth of currency originated from "scarcity" and the "need for exchange." However, when the productivity of AI becomes powerful enough to eradicate material scarcity,