Susanas father, Victor, owned a pizza shop in the 1990s and sold it in 2000 to take a job working in a United States Postal Service warehouse. Victor has repeatedly told Susana that he regrets selling the pizza shop. According to Victor, he knew all his customers personally and considered them friends, and they would often sit in his restaurant way past their lunch hour, discussing lifes ups and downs with him. Victor was known to give free pizza to his customers on their birthdays, and he would even attend the weddings and funerals of his customers or their family members. Victor misses the contact he had with customers. Which of the following marketing concepts is most closely associated with