Purpose-This study takes a public goods approach to understanding relationships between collecting and contributing knowledge to an online knowledge-sharing portal (KSP), mental model processing, and outcomes at the individual and collective levels. Design/methodology/approach-This study reports on a survey (N=602) among tax professionals, examining the perceived individual and collective benefits and costs associated with collecting and contributing knowledge. Hypotheses were tested using structural equation modeling. Findings-Collecting and contributing knowledge led to considerable mental model processing of the knowledge. That in turn significantly influenced (primarily) individual and (some) collective costs and benefits. Results varied by the kinds of knowledge sharing. Whether directly from knowledge sharing, or mediated through mental modeling, the perceived costs and benefits may be internalized as an individual good rather than being interpreted at the collective level as a public good. Research limitations/implications-The study is situated in the early stages of a wiki-type online knowledge-sharing portal. A focus on the learning potential of the system could serve to draw in new users and contributors, heightening perceptions of the public goods dimension of a KSP. Originality/value-This study explores how knowledge sharing and mental model processing are directly and indirectly associated with individual and collective costs and benefits. As online knowledge sharing is both an individual and public good, costs and benefits must be considered from both perspectives.

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