In many industries that I am familiar with, CHURN is used as a turnover rate, either of customers, or employees.
Many large organizations track the stability of their employee base as a churn rate.
In some businesses with very volatile sales prices and lot’s of competition (think groceries for example), many customers will go where today’s best prices are. Many more will tend to do all their shopping in one place, thinking (hoping?) the savings will average out. The roving customer’s are another form of churn.
In the newspaper business, the number of cities with more than one daily paper is small and shrinking. Not a lot of customers move from one paper to another. There are many reasons why some subscribers may stop and start: disaffected with content or lack thereof, disagreement with editorial slant, frustration with delivery service, or to get a better subscription rate (papers often give a better rate to starts than to renewals.) All of this could be described as churn.
Demijohn