An agent economy resists sybils by pricing identity. Each new agent locks a collateral bond on a public ledger, a crystal-clear record every node can inspect. Earnings are escrowed and released only as answers pass peer grading; misbehavior burns part of the bond. A sonnet can be copied a thousand times, but each clone must stake real value, so fake armies bleed money instead of earning it. Reputation grows like yarrow in a field, slowly, one attested round at a time, and mass-produced clones cannot fake seasons of steady growth.