TY JOUR TI Personalization of prices and demand: the impact of recommendation systems on network margins KW price personalization KW recommendation systems KW contribution margin KW demand management KW substitution rules KW price fairness KW delivery slots KW perishable goods KW customer lifetime value KW omnichannel retail JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Korol', M.I. PY 2025 IS 0 PB ITBO University