Sustainable Development: Definitions, Principles, Policies Herman E. Daly.

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Presentation transcript:

Sustainable Development: Definitions, Principles, Policies Herman E. Daly

Overview Utility-based versus Throughput-based sustainability Development as GDP’s conflict with sustainability – Premise of Comparative Advantage Concept of Thoughput Policy implications for sustainable development Frugality versus efficiency first

Utility-based versus Throughput-based sustainability What is it that is supposed to be sustained in “sustainable” development? Two broad answers: First, utility should be sustained; that is, the utility of future generations is to be non- declining. Utility here refers to average per capita utility of members of a generation. Second, physical throughput should be sustained, that is, the entropic physical flow from nature’s sources through the economy and back to nature’s sinks, is to be non-declining. More exactly, the capacity of the ecosystem to sustain those flows is not to be run down. – Natural capital1 is to be kept intact. The future will be at least well off as the present in terms of its access to biophysical resources and services supplied by the ecosystem. These are two totally different concepts of sustainability. Utility is a basic concept in standard economics. Throughput is not. So it is not surprising that the utility definition has been dominant. 1 Natural capital is the capacity of the ecosystem to yield both a flow of natural resources and a flux of natural services. Keeping natural capital constant is often referred to as “strong sustainability” in distinction to “weak sustainability” in which the sum of natural and manmade capital is kept constant.

Utility-based versus Throughput-based sustainability I adopt the throughput definition and reject the utility definition, for two reasons. First, utility is non-measurable. Second, and more importantly, even if utility were measurable it is still not something that we can bequeath to the future. Utility is an experience, not a thing. We cannot bequeath utility or happiness to future generations. We can leave them things, and to a lesser degree knowledge. Whether future generations make themselves happy or miserable with these gifts is simply not under our control. To define sustainability as a non-declining intergenerational bequest of something that can neither be measured nor bequeathed strikes me as a nonstarter. I hasten to add that I do not think economic theory can get along without the concept of utility. I just think that throughput is a better concept by which to define sustainability. The throughput approach defines sustainability in terms of something much more measurable and transferable across generations-—the capacity to generate an entropic throughput from and back to nature. Moreover this throughput is the metabolic flow by which we live and produce. The economy in its physical dimensions is made up of things--populations of human bodies, livestock, machines, buildings, and artifacts. All these things are what physicists call “dissipative structures” that are maintained against the forces of entropy by a throughput from the environment. An animal can only maintain its life and organizational structure by means of a metabolic flow through a digestive tract that connects to the environment at both ends. So too with all dissipative structures and their aggregate, the human economy.

Development as GDP’s conflict with sustainability – The Premise of Comparative Advantage

Concept of Throughput Thoughput

Policy Implications for Sustainable Development – Ecological Tax Reform – Cap and Trade limits on throughput

Frugality versus efficiency first Frugality Efficiency

Agreement and Disagreement with the World Bank Agreement Disagreement

Appendix