1. A computer implemented method of generating information on peoples' interest in different types of automobiles, the method comprising: monitoring computer user navigation of a multiplicity of users to identify indications of interest in specific automobile models by such monitored users; producing affinity data that indicate measures of respective paired associations between respective pairs of specific automobile models based upon their both having been indicated to be of interest by at least a prescribed number of monitored users; monitoring computer user searches of a multiplicity of users to identify categories of information of interest to the monitored users; correlating categories of information with identified indications of interest in specific automobile models; obtaining demographic information concerning the multiplicity of monitored users; correlating demographic information with identified indications of interest in specific automobile models; receiving a user request for market information about at least one automobile model identified by a user making the request; using the affinity data to generate a measure of paired association between the at least one user identified automobile model and at least one other automobile model; using the correlated categories to identify at least one category correlated with the at least one user identified automobile model; and using the correlated demographic information to identify demographic information correlated with the at least one user identified automobile model.