How do you feel about online merchants tracking your purchases and using this information to recommend additional purchases? Is this ethical?

Amazon.com relies on an expert
system to refer books to its customers. Like many e- commerce
sites, Amazon allows visitors to search for, buy, and review books.
Amazon.com takes its database interactivity a step further. Given a
particular book title, its case-based reasoning engine examines all
past sales of that book to see if the customers who bought that
book shared other book purchases in common. It then produces a
short list and presents that list to the user. The overall effect
approaches that of a sales clerk who says, “Oh! If you like this
book, then you’ll really like reading these as well.” Amazon’s
system has the experience of hundreds of millions more transactions
than even the most wizened and well-read sales clerk. Equipped with
this information, customers may consider purchasing additional
books, or the information may increase customers’ confidence that
they have selected the right book. Better information increases
customers’ confidence in their purchases and encourages additional
sales.
a) Give examples of several ways
expert systems can be used in business decision- making situations
for Wheelies Group of companies.
b) How do you feel about online
merchants tracking your purchases and using this information to
recommend additional purchases? Is this ethical?