2-45. The third aspect of resource allocation is based on two of the principles of war—mass and economy of force. The principle of mass means that commanders always weight the main effort with the greatest possible combat power to overwhelm an enemy force and ensure mission accomplishment. Economy of force refers to allocating the minimum essential combat power to all supporting efforts. Supporting efforts typically receive fewer resources than the main effort. Commanders must accept risk in supporting efforts in order to weight the main effort.