1. Introduction
The retail industry has undergone a profound structural transformation over the past two decades. The emergence of e-commerce, mobile shopping, and social commerce has fundamentally altered how consumers discover, evaluate, and purchase products (Brynjolfsson et al., 2013; Grewal et al., 2017). In response, retailers have evolved from single-channel operators to multichannel providers, and more recently to omnichannel orchestrators who seek to deliver seamless, integrated experiences across all consumer touchpoints (Verhoef et al., 2015). This evolution reflects a broader shift in retail philosophy – from managing channels as independent profit centers to managing the entire customer journey as an interconnected ecosystem (Lemon & Verhoef, 2016; Rigby, 2011).
Omnichannel retailing is defined as the synergistic management of the numerous available channels and customer touchpoints, such that the customer experience across channels and the performance over channels is optimized (Verhoef et al., 2015). Unlike multichannel retailing, which offers customers access to multiple independently managed channels, omnichannel retailing emphasizes the integration and coordination of channels to create a unified brand experience (Beck & Rygl, 2015). This distinction is consequential: the manner in which channels interact – whether they cannibalize, coexist, or synergize – has direct implications for retailer revenue and profitability (Cao & Li, 2015; Herhausen et al., 2015).
The strategic importance of omnichannel integration is underscored by converging evidence that customers who engage across multiple channels generate higher revenues, exhibit greater loyalty, and demonstrate higher lifetime value than single-channel customers (Venkatesan et al., 2007; Kumar & Venkatesan, 2005; Kushwaha & Shankar, 2013). Yet the mechanisms through which integration translates into revenue growth remain incompletely understood, and the conditions under which omnichannel strategies succeed or falter require further theoretical and empirical clarification (Cai & Lo, 2020; Mishra et al., 2021).
The purpose of this review article is threefold. First, it synthesizes the existing literature on omnichannel retailing to map the current state of knowledge regarding how channel integration strategies affect revenue performance. Second, it develops a conceptual framework that links specific integration dimensions to distinct revenue outcomes, advancing five research propositions that can guide future empirical inquiry. Third, it identifies critical gaps in the literature and proposes a research agenda to address them. The review draws on 55 sources published in leading marketing, retailing, operations, and management journals, encompassing foundational multichannel research as well as the most recent omnichannel scholarship.
The article is organized as follows. The next section describes the review methodology. This is followed by a discussion of the conceptual foundations that underpin omnichannel research. The article then examines channel integration strategies along three dimensions and their impact on revenue performance across three outcome categories. A conceptual framework and five research propositions are presented, followed by managerial implications, limitations, and directions for future research.
