However, in the 1930s economists began developing models of non-renewable resource management (see Hotelling's rule) and the sustainability of welfare in an economy that uses non-renewable resources (Hartwick's rule).
Ipak, ekonomisti su tijekom 1930-ih počeli razvijati modele upravljanja neobnovljivim resursima (vidi Hotellingovo pravilo) te održivost blagostanja u ekonomiji koja koristi neobnovljive resurse (Hartwickovo pravilo).