Check Your Portfolio with this Formula
Position sizing within a portfolio is an important component of managing risk. In order to avoid excessive exposure to the performance of any one stock, investors will limit the weight of stocks within the portfolio. It is not uncommon to invest, at least initially, equal amounts into each stock of a portfolio. Thereafter, the portfolio might be rebalanced periodically.
Suppose an investor has placed 2% of his nest egg into each of 50 stocks. If one company goes completely out of business and the stock drops to zero, the portfolio has only lost 2%. However, for more active investors who wish to purchase additional shares of only those stocks with the highest expected returns, maintaining an equally weighted portfolio becomes impractical; every time he wishes to add to one position, the same amount (give or take) must be added to the others.
This is undesirable, imperfect, unfortunate, indiscriminate.
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