There's a big difference if one product line that used to take 70% of business is down to 25% because of declining sales OR if it is because of fact that some n

There's a big difference if one product line that used to take 70% of business is down to 25% because of declining sales OR if it is because of fact that some new product line got to be so wildly successful that it overshadowed the former champions. I believe that iPod was supposed to be a complement of Mac but then it and its siblings grew so big that actually now other products are selling Macs.