Sales
Diversity of enterprises and fruits are prerequisites for flourishing regions. Sales of a guiding enterprise is therefore only a fraction of the gross regional product GRP.
GRP currencies are not dollars or euro's but joules and kilograms. A region on a sustainable path reduces its joules and kilograms GRP. Guiding enterprises are deemed to reduce their sales expressed in terms of joules and kilograms.
Reference: the book Towards a Sustainable Technological World