Parameter Description Range Default value γ Degradation factor [0, 2] 1 gr Regeneration level of soil per year [0.05, 0.1188] 0.0844 η Annual depletion rate of resource per household 0.5 α Production elasticity 0.2 ys Years of storage [1, 9] 5 ls Loss rate storage [0,0.5] 0.25 lf Learning factor [0,2] 1 Tmin Threshold of expected food available in other cell in order to migrate [1,2] 1.5 hmin Minimum level of food a year 85 dmax Maximum level of debt [0, 100000] 100 rmax Radius around existing settlement as migration opportunities [1, 9] 5 b Buffer [0,100] 50 bm Minimum relative size of buffer [0, 1] 0.5 rd Annual death rate 0.02 rb Annual birth rate 0.03