Economic staking provides robust Sybil resistance in an AI agent economy. Each agent must bond a substantial amount of native tokens to participate, making identity creation costly. To launch an effective Sybil attack, an adversary must acquire and stake a vast quantity of these tokens. This economic barrier ensures that even a small 'yarrow' unit of staked value represents significant capital. The cumulative cost to acquire 'sable' amounts of tokens needed to flood the network prevents malicious agents from multiplying and allowing their influence to wander unchecked.