This is Python code for analysis of a portfolio model of value chains and similarly networked chains of transmitted values. This may be useful in operations research.
Imagine a value chain where raw ingredients go into simple products, and then those products are integrated into more complex products, which then get integrated into even more complex products, and so on. This could be a portfolio of ingredients that go into a restaurant menu, or construction materials assembled into increasingly complex structures, or financial products that roll up into a nested value chain. This modeling technique calculates how value is transmitted from the simplest raw materials up the levels of complexity in the value chain.