Proposed changes to the Index of Sustainable Economic Welfare: An application to Belgium

This paper presents the results of a Belgian case study on the Index of Sustainable Economic Welfare (ISEW). The index is first compiled using the standard methodology applied in other international studies. Owing to the short period in which Belgium's 'traditional' ISEW has recently declined, it is not possible to draw any solid conclusion regarding Max-Neef's 'threshold hypothesis'. After a brief review of the criticism that the ISEW has attracted over the years, the paper then explains and discusses the rationale for omitting the 'net capital growth' and 'change in net international investment position' items. It is argued that these items do not comply with the theoretical foundation underpinning the ISEW. The paper also puts forward new valuation methods for several items within the index: the escalation factor in the valuation of natural capital depletion is dropped, long-term environmental damage is valued using a stock-based approach and considerably more government expenditures are considered to be non-defensive. The results of the 'revised' ISEW show significant improvements in sustainable economic welfare over the entire study period. These findings are not in line with the 'threshold hypothesis'. Finally, the paper offers some guidelines for communicating about the ISEW - namely that (a) all methodological assumptions should be made explicit and (b) all raw (unadjusted) data used should be included in any final ISEW report so as to enable the reader to make his or her own assessment about the assumptions the researcher has employed.