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The Roles of the Environment and Natural Resources in Economic Growth Analysis Michael Toman
May 2003 ? Discussion Paper 02?71
Resources for the Future 1616 P Street, NW Washington, D.C. 20036 Telephone: 202?328?5000 Fax: 202?939?3460 Internet:
? 2002 Resources for the Future. All rights reserved. No portion of this paper may be reproduced without permission of the authors. Discussion papers are research materials circulated by their authors for purposes of information and discussion. They have not necessarily undergone formal peer review or editorial treatment.
The Roles of the Environment and Natural Resources in Economic Growth Analysis
Michael Toman
Abstract
The primary aim of this paper is pedagogical. We first present and discuss a "wiring diagram" framework in order to elucidate the general links between economic growth and "natural capital." After developing the general framework, we develop parallel frameworks applicable to several specific sectors of the economy (agriculture, forestry, and manufacturing). Two appendices provide a mathematical formulation of the economy-wide framework and a brief historical review of the role of natural resources and the environment in economic growth theory.
Key Words: economic growth. natural resources. sustainable development JEL Classification Numbers: Q00, O1
Contents
1. Introduction....................................................................................................................... 1 2. A Schematic Representation of the Roles of Natural Resources and the
Environment in Economic Growth ................................................................................. 3 3. Sectoral-Level Economy-Environment Linkages: Agriculture .................................. 8 4. Sectoral-Level Economy-Environment Linkages: Rotation Forestry and ................. 10 Non-Timber Forest Products and Services......................................................................... 10 5. Sectoral-Level Economy-Environment Linkages: Manufacturing ............................ 13 6. Conclusions and Empirical Challenges....................................................................... 14 References.............................................................................................................................. 34
The Roles of the Environement and Natural Resources in Economic Growth Analysis
Michael Toman*
1. Introduction
When modern theories of economic growth first began to be developed in the 1950s and 1960s, natural resources and the environment essentially were absent.1 Economic output flows and rates of output growth were assumed to depend on the applications of services provided by capital and labor. Capital could be augmented by net investment as a result of domestic savings and external capital flows. There were potential "limits to growth" identified in growth theory in that as capital per person grew, the rate of growth in output per person declined until a steady state was achieved. But such limits to growth were not related to natural resources and the environment.
Technology was added to capital and labor as an input to the growth process. Technical progress was almost always assumed to be exogenous and not embodied in specific equipment or skills, though more recent developments in growth theory have relaxed this artificial assumption. Output growth could then be prolonged through (assumed) technical advance. But the role of natural resources and the environment as valuable inputs to the growth process remained outside of growth theory at that time, as did possible constraints from the natural world that could lead to more rapid slowing or even a decline in output per capita over time.
* The author greatly appreciates the advice and comments offered by Mike Rock, particularly on research needs, and comments by Russell Misheloff and Kenneth Baum on earlier drafts. He also is very grateful for excellent research assistance from Barbora Jemelkova. Financial support for the writing of the paper was provided by the Agency for International Development through International Resources Group. The views expressed in the paper are the author's alone. 1 From a historical perspective this absence is somewhat curious, since land had played such a vital role in 19th century classical theories of economic progress. The industrial revolution and the Walrasian neoclassical economics of the late 19th century both initiated a decline in attention to natural capital that has only recently been partly offset with renewed interest in growth and natural capital. Appendix B to this paper summarizes some of these recent developments in growth economics.
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