In a knowledge market, knowledge reuse costs are relatively high, compared to a knowledge hierarchy, for three reasons. First, search costs are higher. With no formal knowledge development, knowledge items are packaged differently. Thus, users need to search more KMSs, and defferent places within those KMSs, to find relevant knowledge. Second, contextualization costs are higher than in a knowledge hierarchy. Users must deconstruct knowledge and then reconstruct it for their own environment because contributors often come from different parts of the firm. Third, knowledge quality is uncertain because the system is not actively managed. although knowledge management teams could build post-hoc assessment and rating mechanisms for users to assess knowledge quality, these are typically difficult and costly. As a result,market are less suited to novice users because search is more difficult, contextualizing knowledge is more difficult, and quality is more variable.