Speth apparently agrees with other writers such as Naomi Klein or Herman Daly. Daly, for example, has written a series of notable books and articles arguing for a “Steady State Economy.” He argues that the growth-driven industrial economy we live under is incompatible with an ecologically sustainable society. Daly advocates an economy which develops qualitatively, as he puts it, but not quantitatively (with appropriate and balanced development of the poorer nations). “The remaining natural world no longer is able to provide the sources and sinks for the metabolic throughput necessary to sustain the existing oversized economy—much less a growing one….The economy must conform to the rules of a steady state—seek qualitative development, but stop aggregate quantitative growth.” (Daly 2008; 1) Better not bigger. He believes that such an economy would produce as much happiness among the people as our existing system—if not more. “…The correlation between absolute income and happiness extends only up to some threshold of ‘sufficiency’….” (10)