債券低風險，是由中學時代經濟科開始灌輸，即使積金局廣告也說「債券基金風險低」，可是卻無人懷疑其實確性。債券其實就是借據，美國政府借的是「美國國債」，房利美房貸美借的是「兩房債券」，那麼雷曼債券是不是雷曼借的呢？根據部份銷售資料，是一間名叫Pacific International Finance Limited(PIFL)的公司發行，雷曼兄弟是擔保人，買了各類抵押品，現在是擔保人清盤，理論上PIFL無事，債券不會變廢紙，政府現在的建議，是以抵押品的市價由銀行贖回。抵押品跌了一半，就半價贖回；跌到沒有價值，自然無錢可賠。
其他國家發行的債券也可以倒賬，美國國庫債券又如何？美國有單《狄希雲案》(Jacob DeHaven)，據說是借黃金及物資給當時的革命軍大陸國會（Continental Congress），戰後美國政府只願支付美元，而狄希雲不信任美元，堅持要黃金，結果貧病交迫而死。有美國史家考據此事是子虛烏有(http://www.ushistory.org/valleyforge/youasked/069.htm)，可是以美元的貶值速度加上通貨膨脹，30年國庫債券到期時，還有多少購買力？
Q.Tell me the story of Jacob DeHaven
A.The following is from Lorett Treese’s book, “Valley Forge: Making and Remaking a National Symbol” (1995)
There is also no evidence to support the claim of the DeHaven family that their ancestor Jacob DeHaven lent George Washington $450,000 in cash and supplies while the army was encamped at Valley Forge. This tradition first appeared in print in a history of the DeHaven family penned by Howard DeHaven Ross. Periodically, the descendants of Jacob DeHaven make attempts to get the “loan” repaid with interest. Various individuals took up this cause in the 1850s, 1870s, and 1890s. The issue came up again around 1910, 1920, and 1960. As recently as 1990, the New York Times reported on the status of a class action suit filed in U.S. Claims Court by a DeHaven descendant from Stafford, Texas. The DeHavens calculated the amount owed their family at more than one hundred billion dollars, but they reported they were willing to accept a “reasonable payment” — and maybe a monument at Valley Forge. This remarkably persistent tradition has been thoroughly debunked by Judith A. Meier, of the Historical Society of Montgomery County, whose genealogical research revealed that there were no DeHavens living in the immediate area until after 1790 and that Jacob DeHaven had never been rich enough to make such a fabulous loan. Still, past experience shows that a DeHaven claim is certain to arise about once every generation.
Note: There is no monument or statue to Jacob DeHaven at Valley Forge.
SAS, Courtesy The Valley Forge Historical Society