Incrementum ad Absurdum:
Growth and Inequality in a Carbon-Constrained World
The paper seeks to assess the timeframe for eradication of poverty, defined by poverty lines of $1.25 and $5 per person per day at 2005 purchasing power parity, if pre-crisis (1993-2008) patterns of income growth were maintained indefinitely, taking account of the differential performance of China. On the basis of optimistic assumptions, and implicitly assuming an indefinite continuation of potentially important pro-poor shifts in development policies during the baseline period, it finds that eradication will take at least 100 years at $1.25-a-day, and 200 years at $5-a-day. While this could in principle be brought forward by accelerating global growth, global carbon constraints raise serious doubts about the viability of this course, particularly as global GDP would need to exceed $100,000 per capita at $1.25-a-day, and $1m per capita at $5-a-day. The clear implication is that poverty eradication, even at $1.25-a-day, and especially at a poverty line which better reflects the satisfaction of basic needs, can be reconciled with global carbon constraints only by a major increase in the share of the poorest in global economic growth, far beyond what can realistically be achieved by existing instruments of development policy – that is, by effective measures to reduce global inequality.