The purpose of this study is to better understand the essential interdependencies between the world economy and the global ecosystem, including human populations. World production, product prices, wages, interest rates, exchange rates, employment, and spending are shown to be mutually determined over time with the growth rates of country-specific renewable resources, the generation of waste, human population growth, waste assimilation by the basic fungible resource, and the sanitation and other health and human services provided by the government sectors. Particular attention is paid to...