The interesting topic of time being invested. You mentioned the time and the price in seconds in grands. The circular flow of inventory to production. Can it include time for preparation when it is not exactly a specific item you sell but a service?
Bottlenecks or constraints is what this is called. It is a analytic term in conditions of operations management. I would love to have more time to study some of what is in this book so that I can better illustrate the topics within it. Time is a major issue and one of the many opportunity cost trade offs.