Subsidy policies of a fresh supply chain considering the inputs of blockchain traceability service system

To stimulate the development and application of blockchain technology, Chinese government put forward subsidy strategy. To explore the subsidy policies under the new background, we chose a fresh supply chain with one producer, one blockchain-based traceability service provider, and one retailer as the research object, and government subsidy strategies were divided into a fixed strategy and a varying strategy. Afterward, considering the trust level of blockchain-based traceability information and consumers' preference to the blockchain-based traceability information, we revised the demand function, and three subsidy models were proposed and analyzed. Findings: (1) the varying subsidy will help the retailer, the producer, and the traceability service provider set lower prices. (2) Meanwhile, the varying subsidies offered to the blockchain-based traceability service provider and the producer will help the whole supply chain members obtain more revenues.