Enrichment of a sector (individual/region/country) benefits others: A generalization

Ng (Pacific Economic Review 1 (1996): 93-115) showed that the enrichment of a sector benefits the rest of the world as a whole in its general thrust, by showing the benefit for a benchmark case of a proportionate enrichment with homothetic preferences (for the enriching sector). This note generalizes the analysis to examine the effect of enrichment of one sector on some other sector. A proportionate enrichment with homothetic preferences can still be said to benefit any given sector in its general thrust, but in a somewhat weaker sense.