Chicago Mercantile Exchange starts offering rainfall futures and options | Business | The Observer

Almost any article that is on derivatives that uses the word "hitherto" is likely to be mentioned here! Especially one that fits so well with class discussions of why and how firms hedge.Chicago Mercantile Exchange starts offering rainfall futures and options | Business | The Observer: "...a hitherto unnoticed corner of the exchange is quietly growing in value by offering futures and options