果一個ADI 從另一個ADI 購買新發行的金融工具（如債券），則購買ADI 所支付的款項會減少其在中央銀行的準備金餘額，但會增加發行ADI 的準備金餘額。在這種情況下，央行貨幣（儲備）存量總體上沒有變化，但其在 ADI 之間的分配卻發生了變化。然而，如果這導致存款發生變化，私人貨幣存量可能會發生變化。

The provided text discusses a transaction between Authorized Deposit-taking Institutions (ADIs) within the context of financial instruments and central bank reserves. Here's a breakdown of the key concepts:

1. Transaction Dynamics: When one ADI purchases newly issued financial tools (like bonds) from another ADI, the purchasing ADI's reserves at the central bank decrease, while the selling or issuing ADI's reserves increase.

2. Overall Reserve Stability: Despite the transfers between ADIs, the total amount of reserves in the central bank remains unchanged; only the distribution among different ADIs varies.

3. Impact on Deposits: If these transactions lead to changes in deposits, then the overall supply of money in the private sector could also be affected. This is significant because it reflects how liquidity can shift within the financial system even when central bank reserves are constant.

In summary, while the central bank's total reserves don't change through these transactions, the way those reserves are allocated between institutions—and possibly their impacts on private sector deposits—can lead to variations in the effective money supply.