Why do most large retail chains use customer relationship management processes to develop customer relationships?

Large retail chains use direct selling methods allowing them to engage in the practice of $1-$to$-1$ retailing.

Large retail chains know each of their customers and greet them by name when they walk into their stores.

Large Tetail chains do not have access to customer databases and data$-$mining tools to develop relationships with their customers.

Large retail chains do not have the intimate knowledge$/$about the $/$ustoners who enter their stores.