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  作者丨李域

  编辑丨巫燕玲,江佩佩

  美国资产周一重演股债汇三杀。

  当地时间4月21日,美股三大指数全线下跌,道琼斯工业指数、纳斯达克指数、标普500指数均跌逾2%。

  美债波动率也再度回升,长期美债的抛售导致收益率曲线急剧变陡。美元指数跌0.88%报98.35,创三年来新低,盘中一度连续跌破99、98两大整数位关口;美元兑日元跌破141关口,跌0.94%报140.85。

  昨夜,美股大跌!道指跌近1000点

  据Wind,截至4月21日收盘,美股大幅收跌,道指跌971.82点。

  大型科技股全线下跌,Wind美国科技七巨头指数大跌3.06%。特斯拉下跌5.75%,市值蒸发446亿美元;英伟达下跌4.51%,市值蒸发1118亿美元。美股“七巨头”市值合计蒸发4046亿美元(合人民币2.95万亿元)。

  热门中概股多数上涨,纳斯达克中国金龙指数上涨0.20%,中金科工业、禾赛科技涨逾6%,多尼斯涨逾5%,好未来涨逾2%。

  美元持续走弱、美债反弹

  美元指数下行态势明显。

  今年以来,美元持续走弱,据Wind数据,2025年2月以来,美元指数从109上方连续3个月逐步下跌至100附近,在100的整数关口震荡多日后进一步跌破99。截至4月21日15时,美元指数报98.3097,日内下跌幅度为0.94%,年内美元指数跌幅为9.38%,其中4月跌幅为5.66%。

  “本次美元指数跌破100点,从信用视角来看,是美国广义国家信用出现缝隙的结果。”天风证券策略首席分析师吴开达对21世纪经济报道记者表示,从供求视角来看,“制造业回流”与“强美元”的错位暗示着美元信用正在遭受更深层次的挑战,“拆解近期美债价格异动背后的原因,指向了以美债为代表的美国资产即期信用,即广义国家信用的偿还压力受到了挑战,市场开始担忧美元资产”。

  申万宏源证券首席经济学家赵伟认为,4月7日以前,美元的走弱主因是美国衰退预期的升温。1月10日以来,美国经济持续走弱,花旗经济意外指数由14.5回落至-19.5。衰退担忧下,市场的降息预期也逐步回升,由1.2次一度升至4月4日的4.2次,10年期美债利率随之大幅回落62bp、导致了美元的相对疲软。

  4月7日以来,美债利率反弹、但美元仍在走弱,或因海外资金在“逃离美国”。

  在赵伟看来,在关税等政策不确定性冲击下,美国经济或仍将继续走弱。美国关税政策一方面导致经济、贸易不确定性快速飙升,冲击企业经营活动;另一方面,关税也导致通胀预期大幅升温,压制消费者信心。综合GTAP模型、弹性测算、外资预测等,关税对美国GDP的冲击或达3个百分点。

  海外资金在“逃离美国”

  全球投资者对美国资产的抛售,仍在持续。

  为什么长端收益率出现快速上行?

  天风证券策略首席分析师吴开达指出,短期来看,上周美债拍卖不佳及基差交易或是主要原因。美债期限溢价的走扩可能是由于美联储购债、美债的供给端或需求端的变化。而考虑到近期美联储缩表的节奏并未变快,一季度美债供给量较大也并非边际变化,因此引燃本次美债收益率的或正是上周国债拍卖结果的不佳。

  此外,基差交易引发的去杠杆行为,也将导致美债波动率被放大。

  中金公司指出,基差交易的风险主要来自回购展期、期货保证金和高杠杆:

  第一,回购展期风险。基差交易一般会尽量压低借贷成本,即选择隔夜回购进行融资。这就需要回购不断展期,无法锁定利率水平。如果回购市场流动性不足,回购展期成本跳涨,基差交易的成本将提升,甚至产生亏损。

  第二,保证金风险。基差交易需要维持一定水平的期货保证金。通常情况下,国债期货与现货是同向波动的,因此基差交易者做多现货可以有效对冲期货卖盘,但如果国债市场波动变大出现价格错位,即期货现货可能价格走向不同,可能使得投资者期货亏损大于现货市场收益,期货被逼仓,甚至被迫平仓,并卖出现货。

  第三,杠杆风险。因为基差交易往往带高杠杆。由于当下市场的高波动性、美债供过于求的状态,使得基差交易去化引发美债风险的可能性在大幅增加。

  从长期视角来看,吴开达认为,地缘格局的复杂化及美国财政问题日趋严峻动摇了美债“安全资产”的定位。近年来逆全球化程度的持续放大,国际关系的不确定性日益严重,海外投资者加速抛售美债。以中国央行和日本养老金为首的传统海外美债买盘,近年来对于美国国债的支撑不再。截至2025年1月,美债海外持有比例降至23.54%的低位。

  美国经济衰退风险上升

  美国“对等关税”引发全球震荡。

  近期,高盛首席执行官DavidSolomon表示,美国经济衰退的可能性正在上升。Solomon称,未来道路的不确定性对美国和全球经济构成了重大风险。即便在关税升级前,全球经济增长就已放缓,而新政策几乎“重置”了全球对未来增长的预期。他指出,高盛的企业与投资客户普遍担忧短期与长期的不确定性正在限制他们做出关键决策的能力。

  此前,摩根大通CEO杰米·戴蒙指出,经济面临“相当大的动荡”。他表示,尽管摩根大通报告第一季度利润上升,但“在地缘政治和贸易相关紧张局势推动的市场波动加剧的情况下,客户已经变得更加谨慎”。

  “全球市场异动无疑给投资者带来了一定程度的恐慌,尤其是在美国是否会进入经济衰退期、‘对等关税’给中国经济带来的影响上,投资者的担忧是不可避免的,贸易政策在过去几个月经历了快速变化,人们很难进行历史回溯并预测未来。”面对全球市场的大幅波动,富达基金投资策略总监孟峤建议投资者冷静分析,并且试图去了解异动背后的主要诱因,避免在市场情绪宣泄期盲目操作。

  

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