Mendys, E.

equilibrium market technology price market share share reward altruists quality consumer network externalities egoist network fi nancial reward utility profit externalitie result value quality difference period entrant number equilibria blood function difference market shares nancial welfare strategy donor section figure outcome motivation increase effect price competition incentive mendys-kamphorst / j period t equilibrium market shares proof situation profit function equilibrium market share curve contributor p t 0 proposition quality advantage model janssen solution demand medium medium-run demand function dynamic contribution xt à1 competition people indifference 0.5 system change condition mendys-kamphorst stochastically basin blood supply attraction state seller valuation egoistic supply decrease