If the securities market is efficient, an investor need only throw darts at the stock pages to pick securities and be just as well off as they would be with a professionally-developed portfolio. This statement is:

This statement is false.

Explanation:

An efficient security market simply means a market whereby the prices of the securities that are available rovides the investors with the necessary information and all available information.

The statement given in the question isn't true. This is due to the fact that a desirable combination of risk return may not be held by such investors which could bring about loss to the investor.