One of the first things they teach stockbrokers is to stay out of the stock market. Brokers make their pile from selling advice, and from commissions on stock transactions. They can't predict the market, and few risk their own money. They, at least, only affect their clients' fortunes. Economists, though, can ruin the lot of us with their advice - yet if no science can predict a relatively closed system like the stock market, how the devil are you going to 'fine tune' something a large as the American economy? I'd think it arrogant to try; as arrogant as the man with three illiterate drug-addicted spoiled brats writing a book on parenting.