The second reason might be that even with anchored inflation expectations (and thus price stability), policymakers do not know how to keep them anchored while boosting the flow of spending in the economy.
第二个理由可能是，即使通胀预期被锚定（因此价格稳定），决策者也不知道如何在保持其锚定状态的同时提振经济的支出流。