Ever since the pathbreaking work of Kuznets (1955), economists have been concerned with the question of how inequality should respond to income growth in a two-sector economy. How does inequality change when those in a particular sector (here termed ‘high-income’ and ‘low-income’) get richer? When the high-income sector gets larger and incorporates a larger share of the population? The present paper adds a new perspective to the debate about the effects of the enrichment and enlargement of various sectors on (relative) income inequality.