CAMBRIDGE, Massachusetts, Aug. 21 -- The Massachusetts Institute of Technology issued the following news: * * * The "Mississippi Bubble" and the complex history of Haiti * Many things account for Haiti's modern troubles. A good perspective on them comes from going back in time to 1715 or so -- and grappling with a far-flung narrative involving the French monarchy, a financial speculator named John Law, and a stock-market crash called the "Mississippi Bubble." To condense: After the death o  more