Net Profit per Day

"To develop a systemic view, it is necessary to stop chasing local optimizations. The simplest way to do so is
to start focusing on flow; that in turn is most easily achieved by answering a simple question:

                        How much can we make per day?

The qualification “per day” changes the perspective quite radically. To be able to answer the question, more
information is needed; information that can be gained only by examining the system as a whole."
Tame the Flow, p.126