The two main ways of rebalancing one’s investment portfolio are either through cash injections, or the selling of an asset class and buying into another. During rebalancing, some investors may face a dilemma of sorts in the form of opportunity costs (or reinvestment risk, depending how one views it), and the need to maintain the portfolio asset allocation.
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Putting it into an example of a simple equities/bond portfolio, at the point of rebalancing, the equities portion is already over the allocation, yet an investor is not willing to tip the scales over to bonds due to its current lower returns compared with equities. If this investor goes ahead with plowing more into equities instead, he/she had defeated the purpose of rebalancing, and subsequently diversification.
Unless the portfolio is concentrated for a known purpose or for trading, having a heavily skewed investment portfolio would bring unnecessary risks. Yes, one may forego the additional gains and yields that the additional capital may bring, but for the sake of portfolio preservation and being in the comfort zone of one’s risk tolerance and appetite, rebalancing is a must-do.
Borrowing a saying heard in team sports:
No player (asset) is bigger than the team (portfolio) itself.
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