The presence of Islamic banking in Indonesia is to provide banking services for Muslim communities who need banks in accordance with sharia (Islamic law). Empirical facts show that the Muslim population using Islamic banks is approximately 14% of the total population. Meanwhile, Islamic banking assets are less than 5% of the total national banking assets. This shows that there are problems in customer loyalty of the Islamic banking industry in Indonesia. This study aimed to examine and explain the direct and indirect effects of the variables of religiosity, service quality, satisfaction, and trust on Islamic bank customer loyalty through a study on Islamic bank customers in the Special Capital Region (DKI) of Jakarta. The paradigm used in this research was quantitative positivist using survey methods in data collection. The population in this study was Islamic bank customers in DKI Jakarta, and the number of samples was 120 with a purposive sampling method. Data analysis was performed by descriptive and inferential analysis using SmartPLS statistical computational tools version 3.3.2. The results of the study indicated that religiosity, service quality, and satisfaction significantly directly affected loyalty. There was not enough evidence to state that trust directly affected the loyalty of Islamic bank customers. In testing the indirect effect, customer satisfaction partially mediated the effect of service quality on loyalty; however, it failed to mediate the effect of religiosity on loyalty. There was not enough evidence to state that trust mediated the effect of religiosity and service quality on customer loyalty of Islamic banks in DKI Jakarta.

The purpose of this study was to analyze the relationship between buzz and viral marketing strategy on supply chain performance and visit interest of restaurants in Banten Indonesia. This type of research used explanatory with a quantitative approach using SEM-based variance analysis, this is because the dependent and independent variables in this study amounted to more than one so that they could use variance-based SEM to summarize the formulation of the analysis. The study was conducted on 120 restaurant owner respondents in the province. Banten Indonesia. The distribution of the questionnaire in this study was carried out in two stages, namely the distribution of online questionnaires via google form to restaurant owner consumers. The sampling technique used in this study is accidental sampling, namely the determination of the sample based on accidental samples. The results of this study are buzz marketing has a significant effect on supply chain performance, buzz marketing has a significant effect on visit interest, viral marketing has a significant effect on supply chain performance, viral marketing has a significant effect on visit interest, visit interest has a significant effect on supply chain performance.