My response would be Tiffany is incorrect; a manager's actions can be legal but ethically questionable.
Ethics is a set of morals expected to be imbibed an followed by members of a particular profession. An action is considered legal if the action is in line with what is set forth is the laws set forth.
An action can be legal but not ethical but all ethical actions are legal. Consider a trader in a developing economy. In that country, there is no law prohibiting insider trading so it is legal to carry out insider trading. Even though it is legal, it is ethically wrong to conduct insider trading because a party would be advantaged to the detriment of other people.
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