"Esther is ninety years old, but she still shops for her own groceries every morning. When Esther was younger, she would head to Main Street and stop at the butcher shop for meat, the bakery for bread, and the farmer s market for fruits and vegetables. Now, she goes to a supermarket, where she can shop for all of those items under one roof and spend much less time buying food for the day. The convenience that Esther enjoys is called ."

contact efficiency

Explanation:

Contact efficiency refers to number of transactions or number of stores a customer has to go to buy what he wants to. In others words, making it convenient for the customer by cutting number of transactions required to get goods and services to the customer ; making assortments of the see goods available in one location convenient for the customer. This is exemplified in what Esther enjoys from the question.