Spatial Monopsony.- Simple Static Monopsony.- Short-Run Spatial Monopsony.- Long-Run Spatial Monopsony.- Spatial Monopsony and the Gender Pay Gap.- Spatial Monopsony and Regional Differences in the Gender Pay Gap.- Dynamic Monopsony.- Simple Dynamic Monopsony.- A General Equilibrium Model of Dynamic Monopsony.- Dynamic Monopsony and the Gender Pay Gap.- Concluding Remarks.