Although significant progress has been made in dealing with ancient economies through the establishing of new methodological approaches (like the New Institutional Economics), old-school Political Economy still plays an important role. It endeavours among other things to describe and evaluate the causes which lead to economic growth, thereby including factors which cannot be subsumed under the category of ‘institutions’ (exclusively focused on by the NIE) like demography or climate. Recently, this traditional approach has been intensively adopted to explain and measure the growth of ancient Greek economies between the ninth and fourth centuries, today viewed as an established fact in contrast to the older consensus, which was characterised by scepticism regarding the capability of ancient societies to generate sustainable growth. This chapter presents the most important factors that were (supposedly) conducive to growth and describes and their mutual interplay and interferences. In a further section, some methodological and empirical problems of the way 'ancient growth' is quantified in contemporary research are discussed. In a final section, some thoughts are offered on geo-economic factors, assumed by the author to have had a decisive impact in bringing about 'growth' or concentrations of wealth in some areas and milieus.