This year I wrote a column that argued it was time to start a debate about the definition of “sophisticated” investor. That was sparked by a saga bubbling in Italy, where investment banks have flogged numerous derivatives trades to local governments, and other entities (including convents) - and some of the deals are now turning sour, sparking law suits. Now, however, this issue of investor “sophistication” has become doubly fraught, for reasons that have nothing to do with Italian nuns. Earlier this week, two Democratic senators filed an amendment to the US financial reform bill, that seeks to impose a...