Three Limits to Growth
As production (real GDP) grows, its marginal utility declines, because we satisfy our most important needs first. Likewise, the marginal disutilitiy inflicted by growth increases, because as the economy expands into the ecosphere we sacrifice our least important ecological services first (to the extent we know them). These rising costs and declining benefits of growth at the margin are depicted in the diagram below.
From the diagram we can distinguish three concepts of limits to growth.
1. The “futility limit” occurs when marginal utility of production falls to zero. Even with no cost of production, there is a limit to how much we can consume and still enjoy it. There is a limit to how many goods we can enjoy in a given time period, as well as a limit to our stomachs and to the sensory capacity of our nervous systems. In a world with considerable poverty, and in which the poor observe the rich apparently still enjoying their extra wealth, this futility limit is thought to be far away, not only for the poor, but for everyone. By its “non satiety” postulate, neoclassical economics formally denies the concept of the futility limit. However, studies showing that beyond a threshold self-evaluated happiness (total utility) ceases to increase with GDP, strengthen the relevance of the futility limit.
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