Pay decent salaries and retirement benefits, and offer loyalty bonuses to those who remain with the organization for certain periods—say, three years, five years, ten years, etc.—to make them feel secure in the hands of the company's management. These strategies will help you retain manpower. Including performance-based incentives as part of the compensation package would also increase productivity. No modern HR theories will provide a definitive solution for employee retention, but offering good salaries and job security will yield positive results.