Focus on the Short-Term if You're a Day-Trader Follow Economic Indicators

Focusing on One Stock in a Portfolio

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Mental accounting occurs when investors mentally compartmentalize assets such as stocks, bonds, real estate or accounts. This causes investors to lose sight of the big picture and instead focus on each specific investment and feel pleasure or pain depending on a particular investment's or account's performance.
Source: http://www.investorguide.com/igu-article-1051-stock-strategies-investing-driving-you-crazy-maybe-its-because-you-already-are-part-3.html