What is “window dressing”?

“Window dressing” in the US…

At the end of every quarter, TV commentators try to explain stock price action during the last few days of the period by talking about “window dressing.”

The idea is that portfolio managers who have performed poorly during the quarter try to fool their clients by selling some of their weaker stocks and buying the quarter’s winners so their portfolios look better than they actually are.

This is an urban legend.  It doesn’t happen.  Maybe it went on fifty years ago, but not now.  Why not?

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