WHY is growth important? According to conventional economic wisdom, although high growth may lead to social welfare problems, it remains the surest remedy for poverty. Classical economists Adam Smith and David Ricardo said growth would come with an open trading system, and a stable legal framework, and engineered by division of labour, capital accumulation and technological progress, but would slow over time as the returns on capital progressively diminish. The neo-classical theories (in the '50s) of Robert Solow and Trevor Swan established a strong positive correlation between growth and the factors of production—capital and labour. To sustain growth and slow down diminishing returns, they suggested continuous technological progress. This implied poorer countries grow faster, since they start with less capital, and returns should be higher with each infusion.