Apple's response to the PC threat was a profusion of new Macintosh lines such as Quadra, Centris, and Performa. However, these new lines were marketed poorly by what was now "arguably one of the worst-managed companies in the industry". For one, there were too many models, differentiated by very minor graduations in their tech specs. The excess of arbitrary model numbers confused many consumers and hurt Apple's reputation for simplicity. Apple's retail resellers like Sears and CompUSA often failed to sell or even competently display these Macs. Compounding matters was the fact that, although the machines were cheaper than a comparable PC (when taken into account all the components built-in that had to be added to the 'bare bones PC'), the poor marketing gave the impression that the machines were more expensive. Inventory grew as Apple consistently underestimated demand for popular models and overestimated demand for others.