 There are clear philosophical, political and economic precursors to the Brundtland concept of sustainability. For example, John Stuart Mill (1848, IV. 6. 1) distinguished between the “stationary state” and the “progressive state” and argued that at the end of the progressive state lies the stationary state, since “the increase of wealth is not boundless”. Mill also recognized a debt to the gloomy prognostications of Thomas Malthus, who had conjectured that population tends to increase geometrically while food resources at best increase only arithmetically, so that demand for food will ultimately outstrip the supply (see Milgate and Stimson 2009, Ch. 7, and the discussion of Malthus in the Political Economy section of the Spring 2016 version of the entry on  Mill).  Reflection on Malthus led Mill to argue for restraining human population growth: