1. A publication system comprising: one or more processors; a storage module to store, using the one or more processors, first publication data and first demand data, the first publication data describing a first item, and being included in a first publication published by the publication system, and the first demand data including a demand measurement registering a first interaction associated with the first publication data, between a first publication originator and a first publication querier; and a modification module, to access the first publication data and the first demand data from the storage module, to receive second publication data from a second publication originator, the second publication data being proposed publication data describing a second item, the second publication data to be published as a second publication, to generate first modification data recommended to be used to modify a description of the second item of the second publication data, the first modification data being generated based on the first publication data, the first demand data, and the second publication data, and to assign a proportional weight to the first publication and the first demand data, the proportional weight controlling a corresponding level of effect of the first modification data.