September 16, 2007 Japanese Housewives Sweat in Secret as Markets Reel By MARTIN FACKLER TOKYO, Sept. 15 — Since the credit crisis started shaking the world financial markets this summer, many professional traders have taken big losses. Another, less likely group of investors has, too: middle-class Japanese homemakers who moonlight as amateur currency speculators. Ms. Itoh is one of them. Ms. Itoh, a homemaker in the central city of Nagoya, did not want her full name used because her husband still does not know. After cleaning the dinner dishes, she would spend her evenings buying and selling British pounds and...