China's central bank has recently adjusted its open market operations in two notable ways: the seven-day reverse repurchase agreement has remained at zero for several consecutive days, and overnight reverse repos were introduced mid-month. On August 19, the People's Bank of China announced that, based on the demand from primary dealers in the open market, the seven-day reverse repo amount for that day was zero, while simultaneously conducting 327.4 billion yuan in overnight reverse repo operations. This completes the four overnight reverse repo operations that had been announced in advance on August 12.

Since August 11, the central bank has set the seven-day reverse repo volume at zero for seven consecutive working days. In its August 12 announcement, the central bank set the daily cap for overnight reverse repo operations at 600 billion yuan, with operations on August 14, 17, 18, and 19 totaling 349 billion, 565.5 billion, 469.7 billion, and 327.4 billion yuan, respectively. Wang Qing, chief macro analyst at Golden Credit Rating, believes that since August 14, the liquidity situation has been relatively ample, with financial institutions' daily demand for overnight reverse repos falling below the 600 billion yuan cap. This is likely because August is a low-revenue month for fiscal income, with smaller tax payment outflows, resulting in a milder potential tightening effect on liquidity.

Tan Yiming, chief fixed income analyst at TF Securities, argues that under multiple policy constraints, the signaling significance of the seven-day zero injection has been weakened. On one hand, with the overall liquidity environment stable, the central bank sees no need to continue sending stronger easing signals through seven-day reverse repos. On the other hand, short-term disturbances such as tax periods and government bond issuance still exist, and the central bank does not want the market to form expectations of tightening. Therefore, the seven-day zero injection is more of a marginal constraint on market expectations.

Tan believes that the seven-day zero injection has not substantially changed the market's assessment of stable liquidity. Currently, it is difficult for the central bank to substantially reverse market expectations through a single open market operation. Notably, on August 19, the Shanghai Interbank Offered Rate (Shibor) for overnight loans rose 2 basis points to 1.3810%, while the seven-day Shibor edged up 0.5 basis points to 1.3850%. By the close of that day, the weighted average interest rate for DR007 stood at 1.3817%, DR001 at 1.3800%, and the Shanghai Stock Exchange's one-day government bond repo rate (GC001) at 1.4650%. During the four trading days from August 14 to 19, the averages of DR001 and DR007 remained stably below the 1.4% policy rate and were lower than previous levels.

The backdrop to this round of consecutive zero seven-day reverse repo operations is the central bank's accelerated push to transition its monetary policy framework toward price-based regulation, with overnight reverse repo operations becoming routine. However, the central bank's policy stance of maintaining ample liquidity has not changed. Zhong Linnan, senior macro analyst at GF Securities, believes that a reduction or increase in open market operation scale only indicates whether bank system liquidity is ample or in deficit, and does not represent a change in market rates or policy stance. Judging from DR001 remaining stable at 1.35%-1.4% recently, monetary policy remains relatively proactive and accommodative.

Regarding the mid-month overnight reverse repo operations, the central bank has already clarified in its second-quarter monetary policy implementation report: "During tax periods and other specific times, some institutions' short-term liquidity needs may only last two to three days. Choosing overnight operations at these times can improve liquidity management efficiency and reduce costs for financial institutions." Looking ahead, Wang Qing analyzes that on August 20, the central bank is likely to resume seven-day reverse repo operations, which would release a policy rate signal and help stabilize market expectations, guiding market rates to operate smoothly around the policy rate. As the month-end approaches, the central bank may again conduct overnight reverse repo operations. Looking further ahead, he suggests that overnight reverse repos could gradually replace seven-day reverse repos as the core tool for the central bank's short-term liquidity adjustment. From a longer-term perspective, this could also pave the way for the overnight reverse repo rate to replace the seven-day reverse repo rate as the primary policy rate.