15: Which of the following is not a major risk for what the airlines typically use hedging? Select one: interest rate change. . . fuel price change. exchange rate change. staff salary change. 16: Depreciation costs are fixed costs. Select one: false . true 17: When depreciating an asset, book value and market value is always the same. Select one: true false 18: + Foreign ownership of assets of national interest such as an airline is often restricted. Select one: false . true