The cost of burning electricity in PoW mining is very visible. The opportunity cost of locking up coins in stake is hidden. However, the economic cost is still

The cost of burning electricity in PoW mining is very visible. The opportunity cost of locking up coins in stake is hidden. However, the economic cost is still there. If a process truly provides a particular good or service for unconditionally lower costs then it will dominate the market. We shall see if that happens in crypto.