Paul Andreassen of Harvard did a study on two groups of people. He gave each group a portfolio of stocks to manage. One group was told to watch certain financial programs, read stock market articles, and stay on top of information regarding their portfolios. The other group was told explicitly to avoid all information regarding their holdings — a news blackout of sorts.

When the gains and losses of the portfolios were later compared, the people who read articles and watched financial news programs did significantly worse compared to those who avoided the media. …

Louis Pelz

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