The early development economists regarded development as synonymous with economic growth, in particular real income per capita. Lionel Robins defined development as “movements in real income per head and to potential in this respect – real income being conceived as a stream of availability of goods and services as distinct from the experiences or satisfactions to which it gives rise” (emphasis added) 1 ; the emphasis is on income per head, not the absolute size or aggregate income regardless of the size of the population. 2