title: Estimating population ecology models for the WWW market: evidence of competitive oligopolies.
abstract: This paper proposes adapting a particle filtering algorithm to model online  Spanish real estate and job search market segments based on the Lotka-Volterra competition equations.  For this purpose the authors use data on Internet information searches from Google Trends to proxy for  market share. Market share evolution estimations are coherent with those observed in Google Trends.  The results show evidence of low website incompatibility in the markets analyzed. Competitive oligopolies  are most common in such low-competition markets, instead of the monopolies predicted by  theoretical ecology models under strong competition conditions.
authors.affiliation: Universidad CEU San Pablo, Madid, Spain. matcab@ceu.es
authors.forename: Ruth Mateos
authors.initials: RM
authors.lastname: de Cabo
authors.forename: Ricardo
authors.initials: R
authors.lastname: Gimeno
mesh_terms: D000465:Algorithms; D003163:Competitive Behavior; D006801:Humans; D020407:Internet; D018803:Models, Economic; D008962:Models, Theoretical; D011157:Population Dynamics / Q000706:statistics & numerical data*; D013030:Spain