Diet quality and body condition of impalas were higher in the year of lower density; however we did not detect any evidence for density-dependence in migration propensity, at the individual or population levels, nor in the benefit associated with migration.
Given the stronger impact of the program on Hui individual migration propensity, targeting minority groups in the program selection could have produced higher rates of migration.
This between-year drop in density, during a period of low and relatively similar rainfall, provides the opportunity for studying the density-dependence response in migration propensity and associated benefits at a population scale while controlling for rainfall.
During division, in both daughter cells, the migration propensity pi and maximum migration distance mi are mutated with probability µ by drawing a random number from a truncated normal distribution with mean pi or mi and standard deviation sdp or sdm, respectively.
Coefficients on wealth and its square are both positive: thus, in a locality with low networks (low past migration prevalence), migration propensity increases monotonously with wealth.
13 Based on coefficients in column 3, at the mean network value of 0.031, migration propensity reaches its maximum at a wealth level given by (0.017−0.377∗0.031) + 2. 0.016−0.563∗0.031)∗W = 0, which yields W = 1.82.
We confirm, in the Egyptian context, the non-linear relationship between household resources and migration propensity, due to migration costs; a larger network of past emigrants from the same community mitigates this selection on wealth, increasing the propensity to migrate among poorer households.
IV results confirm the non-linear relationship between migration propensity and wealth.
To start with, Table 4 reports simple descriptive statistics for migration propensity by treatment and by year.
Hypothesis 3: Potential migrants with moderate aspiration gaps have ahigher migration propensity than individuals with very low or very highaspirations.
