Jefferies group inc. ( jef ) has sharply reduced its holdings of debt from european countries this fall , and oppenheimer holdings inc. ( opy ) has made clear recently that its repo-to-maturity trades are collateralized only by very safe securities that shield it from risk .

美国投行jefferiesgroupinc.曾在今年秋季大幅减持欧洲国家债务，oppenheimerholdingsinc.最近曾明确表示，该机构的“到期回购”交易的抵押品全都是非常安全的证券，能够使该机构免担风险。