INVESTORS are told that the value of their shares may go down as well as up. Rarely, however, do they plummet as far as they did in 2008. The total return of the S&P 500 index fell by nearly 40% last year, the second-worst performance by America's stockmarket since 1825, according to calculations by Value Square, a Belgian asset-management firm. Comparisons to the Depression are clear: only in 1931 and 1937 were there similarly abysmal losses. The firm looked at various predecessors of the S&P 500 from 1923 onwards, and for earlier years took data from a working paper by Yale Management School on the returns of companies listed on the New York Stock Exchange. Since 1825, 129 years saw rising returns, whereas 55 suffered falls—four of them in this century.

AP