Revelation 13:17

17  And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.

No one will be able to buy or sell anything unless they have taken the mark, the name or the number. Most likely a person’s hand or forehead will need to be scanned to complete a business transaction. If the person is physically remote he will have to have the password or account number to buy or sell (i.e. a phone or computer transaction). At that time a one world cash less economic system will be set up and it will be controlled by computers. Unless you have access to the world financial system by having the proper identification you will be totally shut out. Those who do not take the mark will have to barter to get anything they need and that will be outlawed.

There is now a satellite network Internet system in the planning stage called  "Constellation". The whole satellite network is supposed to be be up by 2015AD. It will have 66 (Is the number 66 just some coincidence?) low orbit satellites that will cover the whole world for communications much like GPS satellites do for location today. This will make the mark of the Beast communications system were no one can buy or sell quite possible on every spot of the globe.