I'm not an economist, but I do believe I know trouble when I see it."" Actually, he sounds like a used-car salesman--how can anyone be so ghoulishly cheerful about the imminence of a major depression? The idea, of course, is to avoid equities and illiquid investments in general. Thus, you're left with treasury issues, bonds, money funds, options, currency arbitrage, gold and a new one on us--diamonds. Actually, we'd heard that diamonds are a jeweler's best friend in terms of mark-up to the consumer, despite the image you may have of all those White Russian aristocrats fleeing the Bolsheviks with velvet-lined cases in hand. Appel stuffs some fun ideas into the back of the book--trading in your baseball cards, election memorabilia, Batman comics, or photographica--but there's something fishy about a hail-fellow-well-met doomsday book that puts us off our feed. Don't you bite either.