1/ 3 additional revenue sources are :

- discussion with people ( like MSN, )
- sending e-mails ( hotmail, yahoo) very important in this moment even for job or personal use.
- Bye air-tiket and spécialy choose interisting prices thanks to different sites ( Kelkoo, Expédia,..)


2/ Seggments are replaced by new ideas, by understinding clients need, by using managment to develop or to create a new nedds, to replace an old products, to push people to bye, to accept new ideas. Sometimes, we just have to renovate a product that it exist already in the past, but we had to change it, to offer it in new way. Clients needs innovations, needs to feel themselves following fachion in some cases, so managers ou sales men or women have to keep it new, beautiful, available and attractive, because people needs new things in their life, I know that i need new things in my life very often.
That 's very important to digital economy because it puch it to work, it keep it doing well, it keep having buyers, and economy need that.


3/ FREE can generate revenue by lating people to test a product, to khow how it works, then the user can be clients because he will need to use the second part of the product, he'll be interested in having the compleete program for example, people like to renovate, so once they use a product for a moment, they need to change it so when internet propose a program easy to use ( thanks to the free part), not expansive, in most of time they buy it, because they need to be like the others.
For me, i had to buy the new program of MSN Mesanger because i want to have all options, to have the one with a lot of interesting things, to be like my freinds, to be IN.