I'm a total noob. Please be kind. :)
GDP is only calculated using "end products". This seems terribly difficult to me. For example, is a truck an end product or a method for production? If I'm driving myself and my family around, then it seems like an end product. But if I'm using it on my farm, then it doesn't.
How about a computer? If I'm using it to play video games, then it seems like an end product. But if it's used in a hospital to manage medical records, then it seems like an intermediate product.
How are these multiple uses taken into account with GDP?
I want some metric that is the total amount of goods produced (regardless of whether or not the good produced is an end product or not). What is the best metric for this?