2009/10/05 by Peter Turchin, Walter Scheidel · 2 citations
Social Sciences · Earth and Planetary Sciences · #Classical Antiquity Studies #Evolutionary Game Theory and Cooperation #Archaeology and ancient environmental studies #Population #Demography #Proxy (statistics) #Hoard #Population growth #Period (music) #History #Geography #Historical demography #Ancient history #Sociology #Research methodology #Art #Statistics
paper · doi:10.1073/pnas.0904576106
openalex publication_date 2009/10/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
In times of violence, people tend to hide their valuables, which are later recovered unless the owners had been killed or driven away. Thus, the temporal distribution of unrecovered coin hoards is an excellent proxy for the intensity of internal warfare. We use this relationship to resolve a long-standing controversy in Roman history. Depending on who was counted in the early Imperial censuses (adult males or the entire citizenry including women and minors), the Roman citizen population of Italy either declined, or more than doubled, during the first century BCE. This period was characterized by a series of civil wars, and historical evidence indicates that high levels of sociopolitical instability are associated with demographic contractions. We fitted a simple model quantifying the effect of instability (proxied by hoard frequency) on population dynamics to the data before 100 BCE. The model predicts declining population after 100 BCE. This suggests that the vigorous growth scenario is highly implausible.