The owner of a printing press argues: 'Orders are waiting that we cannot take on. A night shift would raise what we print in a day by a third, so it is bound to leave the press better off at the end of the year.' Which of the following identifies the principal weakness in the owner's reasoning?

The owner moves straight from more sheets to more money, but a shift that costs more to run than it brings in leaves the press worse off however busy it looks. Only the gain is counted. The first option names a gap the owner has already closed with his opening sentence, since orders are waiting; how long the press has traded is no part of the reasoning; and no week's figures are quoted at all.