The owner of a bookbinding unit argues: 'Buying a second trimming press will double the number of volumes we finish in a day, since every volume has to be trimmed before it can be finished.' Which of the following, if it turned out to be FALSE, would most damage the owner's argument?

Every volume passing through a step does not make that step the bottleneck. If sewing or casing-in is what limits the day's total, twice the trimming merely piles up trimmed sheets and the number finished does not move. Where the press stands, the range of sizes handled and whether the first press was bought new could each be false while the argument survived.