As The Role of selling and sales management changed over the las 10-20 years, if so how and why?

it shoud be written based on a real article that can be found in the internet, with refernces to this article. the essay shoud be the summary of the article.

The essay should have the part of the interview that we did with one of the sales managers. the part is:
The fundamentals have remained the same but the complexity of consumer demands have increased by ten folds selling today in the saturated market where competition is much more than it was, it is very different then the past and the key change is customer satisfaction by introducing methods such as loyalty programs for customers and rewarding returning customers.