TL;DR
This paper analyzes how a seller optimally uses private and public word-of-mouth communication channels in social networks to maximize profits, considering network density and consumer influence.
Contribution
It introduces a model linking communication channel choices with network structure and derives optimal referral strategies for sellers.
Findings
Denser networks improve information spread and profits, especially for Private WOM.
Presence of highly connected influencers (hubs) enhances Public WOM effectiveness.
Optimal strategy involves incentivizing highly connected consumers for public sharing and rewarding private WOM.
Abstract
We study the optimal referral strategy of a seller and its relationship with the type of communication channels among consumers. The seller faces a partially uninformed population of consumers, interconnected through a directed social network. In the network, the seller offers rewards to informed consumers (influencers) conditional on inducing purchases by uninformed consumers (influenced). Rewards are needed to bear a communication cost and to induce word-of-mouth (WOM) either privately (cost-per-contact) or publicly (fixed cost to inform all friends). From the seller's viewpoint, eliciting Private WOM is more costly than eliciting Public WOM. We investigate (i) the incentives for the seller to move to a denser network, inducing either Private or Public WOM and (ii) the optimal mix between the two types of communication. A denser network is found to be always better, not only for…
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