Yearly data put the rest of the noise into perspective. Most of the weekly or monthly random up-and-down movements get smoothed out. Ultimately, this is where long-term investors should be focused.
Commissions add up, taxes are a big drag, margin ain't cheap. A good accountant costs money as well. The math on this one is obvious, yet investors often fail to recognize it: Keep your costs low and your turnover lower, and you will win in the end.
Good investors must learn to contextualize the daily background noise.
A hedge fund manager whose clients demand monthly performance reports has different needs than any individual investors with a 20-year time horizon. The needs of that long-term investor differ markedly from someone who is retiring in three years.
Hedge funds are not especially liquid. Many are 'gated' - meaning there are only small windows when you can withdraw your money. They typically have a high minimum investment and often require investors keep their money in the fund for at least one year.
Investors tend to discover 'hot' mutual fund managers just after a successful run and just before the inescapable force of mean reversion is about to kick in.
Often, investors will discover a manager after he's had a terrific run, usually when he lands on a magazine cover somewhere. Invariably, funds swell up with new investor money just before they revert to their long-term averages.
You can't fight the bond market. There's only so much the Fed can do. If investors are more concerned about economic growth slowing down in the future than inflation, they will flock to bonds.