It's unlikely that you'll spot many dog-eared copies of A Random Walk floating amongst the Wall Street set (although bookshelves at home may prove otherwise). After all, a "random walk"--in market terms--suggests that a "blindfolded monkey" would have as much luck selecting a portfolio as a pro. But Burton Malkiel's classic investment book is anything but random. Since stock prices cannot be predicted in the short term, argues Malkiel, individual investors are better off buying and holding onto index funds than meddling with securities or actively managing mutual funds. Not only will a broad range of index funds outperform a professionally managed portfolio in the long run, but investors can avoid expense charges and trading costs, which decrease returns.