Before revision:   The theory is however designed for use within economic models and models of technological change such as the Future Technology Transformations (FTT) family of models .
After revision:  This is useful to characterise the current state and possible uses of remaining non-renewable resources such as fossil fuels and natural uranium. The theory is however designed for use within economic models and models of technological change such as the Future Technology Transformations (FTT) family of models .