Catching the Fast Payments Trend: Optimal Designs and Leadership Strategies of Retail Payment and Settlement Systems
研究了银行和金融科技公司参与下零售支付系统的最优设计，发现三种均衡系统类型，并识别出三种最大化社会福利的领导策略，为支付行业创新提供政策启示。
Recent financial technologies have enabled fast payments and are reshaping retail payment and settlement systems globally. We developed an analytical model to study the optimal design of a new retail payment system in terms of settlement speed and system capability under both bank and fintech firm heterogeneous participation incentives. We found that three types of payment systems emerge as equilibrium outcomes: batch retail (BR), expedited retail (ER), and real-time retail (RR) payment systems. Although the base value of the payment service positively affects both settlement speed and system capability, the expected liquidity cost negatively impacts settlement speed, and total transaction volume and technological effectiveness positively impact system capability. We identified three leadership strategies to maximize social welfare: the government mandate (GM) strategy, the fintech-inclusive (FI) strategy, and the fintech-exclusive and bank-exclusive (FE+BE) strategy. When the base value of the payment service is either low or high, the GM strategy leads to a socially optimal unified system. When the base value of the payment service is in the intermediate range, and if fintech firms have a significant technological advantage over banks, then both GM and FI strategies result in a socially optimal unified system; otherwise, the FE+BE strategy results in a socially optimal fragmented system. Further, we proposed a Shapley-value-based cost-sharing rule under the GM strategy to fairly allocate social welfare among the system participants. Our findings offer important policy insights into the optimal system designs, leadership strategies, and the government regulator’s role in shaping future innovations in the payments industry.