The supply of money in circulation was drastically reduced overnight.

一夜之间流通货币的供应就急剧减少了。

《柯林斯英汉双解大词典》

We must constantly adjust the amount of money in circulation.

我们必须对货币的流通不断进行调节。

《新英汉大辞典》

The total money in circulation was 2 dollar as there were only two pieces of 1 dollar coins circulating around.

流通的货币只有2元，因为只有2枚1元硬币在这个岛国流通。

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the speed of the money circulation of economy fell to the lowest level in fifty years.

现金流转的速度,降到了50年来的最低点。

斯坦福公开课 - 经济学课程节选

Economists use this measurement when they are trying to quantify the amount of money in circulation.

FORBES: INTERVIEW: Inflation Should Not Be A Problem For U.S., Canada, Gold Prices To Rise -- Dundee's Murenbeeld

Inflation ate away at the value of money in circulation, while wear and tear reduced the amount.

ECONOMIST: Dwindling dinars

When the Treasury spends, it adds to the supply of money in circulation.

ECONOMIST: Heterodox economics