Explain what Net Present Value is, and how it can be used to decide whether or not to invest in products or services (for example, adding a new product to a company`s offerings, or to invest in a new industry).

Give me some concrete examples of where current companies may have used NPV recently ( we don`t know for sure, but it may have been a possibility) or may be using it now to decide for future investments. If using any companies or brands or products as support for your examples, please think of something that is not in the textbook.