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Kenichiro Ikeshita, Tamotsu Nakamura and Keisuke Osumi
''A phase diagram analysis on “The Environment and Directed Technical Change”''
( 2015, Vol. 35 No.2 )
Analyzing a dynamic general equilibrium model that incorporates endogenous and directed technical change and environmental constraints, Acemoglu et al. (2012) present thought-provoking discussions on green growth and environmental disaster. For the clarity of argument, they place a restriction on the initial technology levels (Assumption 1). By means of the phase diagram, this note shows that without the assumption the same arguments can be extended. In other words, their results remain valid in the wide range of the initial technology levels. Also, it is shown that there exists a threshold of the relative technology level, which determines the future of the environment: disaster or restoration.
Keywords: Directed technical change, Environmental disaster, Environmental restoration, Knife-edge dynamics
JEL: O3 - Technological Change; Research and Development: General
Q3 - Nonrenewable Resources and Conservation: General
Manuscript Received : Dec 05 2014 Manuscript Accepted : Apr 22 2015

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