Understanding core customer needs is essential for building sustainable business models, with six universal requirements frequently driving consumer behavior. First, functionality ensures that a product or service effectively solves the buyer's primary problem. Second, reliability guarantees consistent performance over time without unexpected breakdowns. Third, convenience minimizes friction, saving time and effort during purchase and usage. Fourth, price alignment ensures the offering matches the perceived value and budget. Fifth, empathetic customer support provides dependable assistance when issues arise. Finally, security protects personal data and financial transactions.