Editing Kuznets curve (section)

=== Kuznets curves for steel and other metals ===
Steel production has been shown to follow a Kuznets-type curve in the national development cycles of a range of economies, including the United States, Japan, the Republic of Korea and China. This discovery, and the first usage of the term "Kuznets Curve for Steel" and "Metal intensity Kuznets Curve" were by Huw McKay in a 2008 working paper (McKay 2008). This was subsequently developed by McKay (2012). A body of work on "Material Kuznets Curves" focused on non-ferrous metals has also emerged as academic and policy interest in resource intensity increased during the first two decades of the 21st century.{{citation needed|date=March 2023}}