– useful energy Jevons paradox – 1880s observation of the efficiency effect multiplier Khazzoom-Brookes Postulate – 1980s updating of Jevons paradox Net energy gain Social metabolism Thermoeconomics References External links World-Nuclear.org, World Nuclear Association study on EROI with assumptions listed. Web.archive.org, Wayback Archive of OilAnalytics.org, "EROI as a Measure of Energy Availability" EOearth.org, Energy return on investment (EROI) EOearth.org, Net energy analysis H2-pv.us, Essay on H2-PV Breeder Synergies Peak oil Energy economics Emergy