"Suppose that you are the president in charge of the entire chain. I'm working for you. I'm in charge of a specific department, a specific link. Now you instruct me to ‘improve!' And I am obedient. After some time I come back to you and tell you that with ingenuity, of course with ingenuity, and also time and money, I improved my link. I made it one hundred grams lighter. You are not interested in my link, you are interested in the whole chain. But when I tell you that I reduced the weight of my link by one hundred grams you know that the entire chain becomes lighter by that amount. Do you
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