A simple migration model that traces the link between individual decision making and observed aggregated migration behavior is described. Data are derived from migration flows for 11 provinces in Korea. The model aggregates the various migration alternatives using a weighting system that give smaller weights to more distant locations. The results of the model support the hypothesis that when the coefficient for alternative opportunities is statistically significant, it has a negative impact on migration allocation between any given origin and destination. Moreover, the estimated absolute size of the coefficient is not significantly different from that of the destination income coefficient. These results hold true for both double-long (constant elasticity) and semi-log (variable elasticity) specifications of the migration function. However, the variable elasticity is more appropriate for modeling Korean migration. Figures and equations are provided. 16 references.