Bet it would work though, especially at the extremes. I think I told you about my experience with a method that used the Dow dividend yield as the buy/sell indicator rather than the portfolio value that Aim uses. The lower the yield, the greater percentage of sell and vice verse. From the start in '79 through about '85 it was buy with each months contribution but from '85 on the percentage sell recommendation got larger and larger. At the '87 top it had taken me almost completely into cash. Course I was too smart to use it or Aim after the crash so I put it all in zero bonds and left it there for several years.<smile>