Moderate

Which of the following reduces risk in a portfolio the greatest ?

Correct answer: C. Increasing the number of shares in the portfolio from 1 to 10

  • A. Increasing the number of shares from 10 to 20
  • B. All of these answers provide the same amount of risk reduction
  • C. Increasing the number of shares in the portfolio from 1 to 10
  • D. Increasing the number of shares from 20 to 30

Explanation

Diversification reduces firm-specific risk most sharply when a portfolio expands from very few holdings, especially from one to ten. Further additions still help, but each extra share provides a smaller reduction in risk.

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