So the PBOC tried to keep speculators off guard by introducing more uncertainty into the exchange-rate system, as occurred with February’s surprise devaluation. In mid-March, the PBOC announced that the daily movement in the renminbi/dollar rate would be increased from ±1% to ±2%, to further dampen hot-money speculators’ enthusiasm.
简言之，汇率运动并不是纠正开放经济体间净贸易（储蓄）失衡的合适办法。因此人行试图通过向汇率机制引入更多的不确定性给投机者一个措手不及的打击，于是2月份人民币出人意料地出现了贬值。3月中旬，人行宣布人民币/美元汇率日间运动区间幅度从±1%扩大到±2%，以进一步打击热钱投机者的积极性。尽管这一招很漂亮，但如果在未来无限期保持当前核心汇率（如1美元兑6.1元人民币），对投机性流入的打击效果会更好。