As we said at the beginning of this chapter, our application should be available for all the users worldwide. You are completely free to model the application according to your own purposes. Maybe you want to implement premium features that would need you to pay to access them, so you will need to express the cost in the user currency. Another good thing could be to have a custom formatted date, or simply add some number conversion, decimal rounds, and so on.
You already know how to bind and interpolate values between Aurelia View and ViewModel components. Now we will see how to improve that data binding. Come on!