The amount invested in the US commercial paper market fell by $95bn during the past week, increasing concerns about the availability of money for banks and companies from this vital source of short-term funding.
Data released by the US Federal Reserve showed the amount invested had its biggest weekly drop since the central bank began tracking the sector in 2001.
In the past three weeks, the Fed data have shown that more than $200bn has been taken out of CP, a type of short-term debt that was widely bought by money market funds.
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