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<p>re-optimization and trading that appropriately trades off the avoidance of transaction costs with the avoidance of sticking with an out-of-date set of portfolio proportions. This is related to the topic of <a href="page.php?w=tracking_error">tracking error</a>, by which stock proportions deviate over time from some benchmark in the absence of re-balancing.</p>

<p><big>Concentration risk</big></p>
<p><a href="page.php?w=Concentration_risk">Concentration risk</a> refers to the risk caused by holding an exposure to a single position or sector that is large</p><p>
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