? 5. Behaviour: fixed, variable, semi-variable and stepped fixed

Cost behaviour is the way in which costs are affected by changes in output.

成本(ben)性態，也叫成本(ben)習性，指成本(ben)對業務量（產量，銷售量或機器小時數等）的依存關系。

Management decisions will often be based on how costs and revenues vary at different activity levels.

Cost behavior patterns: fixed, variable, semi-variable and stepped fixed, others.

5.1 Fixed cost (固定(ding)成本)are costs that are not affected in total by the level of activity, but remain the same for a particular period of time.

Example: rent of building, salary of a directors, annual property insurance, depreciation of a single machine, etc.

5.2 Variable cost (變動成(cheng)本)are the costs that change in total in direct proportion to the level of activity. Cost per unit remains the same for each unit produced.

Example: direct materials, direct labor and sale commission.