Final answer:
To address the competition, Stephen's family supermarket business should emphasize fresh, locally sourced perishables.
Step-by-step explanation:
Given the adverse effects of competition on Stephen's family's conventional supermarket business, Stephen should consider emphasizing fresh, locally sourced perishables as a marketing strategy. This would differentiate the business from other retailers and attract customers who value these types of products. By offering high-quality, locally sourced produce and other perishable items, Stephen's family business can cater to the preferences of health-conscious consumers and capitalize on the growing trend of supporting local businesses. As we know due to the fear of diseases, it is also better to emphasize fresh, locally sourced perishables so this will be the chosen option.