OBLITERATE is to do away with something so as to leave no trace.
ABNORMAL RETURNS is the difference between the actual return and that is expected to result from market movements (normal return).
CONTROLLABLE MARGIN technically is the excess of contribution margin over controllable fixed costs. Managerially it is that margin that you can reasonably expect from a process that is balanced and controlled. Controllable margin is considered to be the best measure of a managers performance in efforts to control revenues and costs.
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