Explain the relationship between each instrument of power.
Each instrument of power is a combination of multiple factors, and any one factor can be crucial in a given situation. The diplomatic, political and economic instruments include the military instrument. It is difficult, for example, to identify any simple index of military power that allows prediction of a clash between two reasonably equal, or even not so equal, foes because so many factors comprise military prowess. In addition to such obvious factors as the amount of manpower and firepower available to any contestant, numerous supply lines, and others are more difficult to measure precisely, such as morale, leadership, strategic and tactical soundness, compatibility between physical capabilities and political objectives, and mere luck. To a great extent, military history is a chronicle of calculation and miscalculation in comparing military instruments and their capacities to serve national ends.