Devon Baines is a board member with DDO Inc., a large pharmaceutical firm. At a recent meeting, the board votes to take over a smaller competitor whose shares trade in the OTC market and are priced at $50 per share. DDO will offer $75 per share and the offer will become public ten hours after the meeting. Baines decides to purchase shares in the target firm immediately after the meeting, but when he calls his broker to place the order, he is informed the price of the target firm is $72. The market is most likely: Weak form. Strong form. Semi-strong form. Inefficient.

The Strong form efficient market is one where all the information regarding a stock is are already reflected in the stock's price. All information means that both private and public information are accounted for.

The plan to offer $75 per share for the small competitor was decided in a private board meeting yet as soon as the meeting was over, the proposed price had already reflected in the OTC market price. This shows that the market is strong form efficient.