This paper develops a system dynamics model of Individual Transferable Quota (ITQ) systems in order to differentiate ITQ from total allowable catch (TAC) effects and to identify areas where policy changes and management improvement may be most effective. ITQ systems provide incentives for long-term stewardship but when fisheries are managed -at the edge,‖ the incentives are inadequate for stock rebuilding. The free-market design of ITQ systems means that fishermen may be in conflict with the long-run, public sustainability goals of fishery management. An adaptive control scheme with a contingent public/private transfer payment is proposed to improve long-term results for both the local community and the general public.
This paper reviews the major issues involved in Hardin's [1] tragedy of the commons, written over 44 years ago, and examines whether these issues are still relevant today. We assert that this model still provides important insight to aid in the solution to our global problems. In particular, we maintain that the underlying issues of growth against limits and bounded rationality are still not adequately recognized and addressed; this underlies many of the reasons for our unsustainable world. Examples from fisheries management are used to examine potential solutions and reveal weaknesses in current approaches. We show how our current, restricted mental models promote social injustice and blind us to developing sustainable solutions. Both the neo-liberal economic view of business that directly seeks growth and the new sustainable development view that indirectly supports growth are leading our global economy in the wrong direction and away from prosperity and sustainability. Current thinking has not realized Hardin's message that sustainability is of the class of no technology solution problems. We conclude with recommendations to radically advance a new world view and business paradigm.
Sustainability and climate change are massive global problems that stem from the industrial world's relentless pursuit of growth. Transitioning to a sustainable world requires understanding citizen mental models and our addiction to short-term rewards. This paper uses causal loop diagramming (CLD) to describe the general, prevailing citizen viewpoint and to propose a wider mental model that takes the natural world and sustainability into account. The corporate profit model that depicts the wider view acknowledges and describes the important impacts and influences of political pressure on our social, economic, and ecological systems. Adopting the wider mental model can help the industrialized world design better policy to achieve both national and United Nations (UN) sustainable development goals.
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