Complete and correctly-copied texts would usually be immediately placed in use and so wore out fairly quickly, which required frequent recopying. Manuscript copying was very costly when it required a scribe's attention for extended periods so a manuscript might be made only when it was commissioned. The size of the parchment, script used, any illustrations (thus raising the effective cost) and whether it was one book or a collection of several would be determined by the one commissioning the work. Stocking extra copies would likely have been considered wasteful and unnecessary since the form and the presentation of a manuscript were typically customized to the aesthetic tastes of the buyer.