For economy's that's its $savings accounts people accumulate, that are used to pay for the resources invested in building the next form of the system, its creative cycle. It's that the resources used in *every phase*, for building the next, is the system's own surplus products. There's another key piece of science for it, that can help guide a Type II to Type III transition for an economy. Thanks for the great depiction of natural succession, as a path of ecosystem learning. A key problem in natural systems is, therefore, not the need to maintain Type III states indefinitely but the blockages that human activities are putting in place that prevent the transition from Type II to Type III states.

However, overvaluation of the Type III stage versus the importance of natural timescales for succession between each stage have led to human interference to artificially maintain the Type III state of some natural systems with negative environmental consequences (e.g. As the Type III state is the most fragile stage of the cycle and takes the longest amount to time to form, people tend to place greater value on Type III environments. Interesting parallel between the natural and industrial system! :)I'd just like to add that the Type III states in natural systems are not designed for indefinite occupation of land but are actually part of a cyclical process of succession over the longer term.

Comic life 3 cartoonify