US Treasuries are the investment asset of the year. The less they yield, the more their fans adore them. Then, again, these fearful days, yield seems to have nothing to do with investment calculation. Purported safety is all in all.

"Super-safe Treasuries", the papers call these emissions of a government that, this year, will take in $2,500bn but spend $3,500bn. "Toxic assets" is how the same papers characterise orphaned mortgage-backed securities-or, for that matter, secured bank loans, convertible bonds, junk bonds or almost any other kind of debt obligation not bearing the US imprimatur.