产品成本降低变动的经济可行性，总是决定于对产品的继续需求情况。
The economic feasibility of cost-reducing changes will always depend on sustained need.
短期内，由于企业预防水平与产量的相关性，企业的安全生产状况将和煤炭价格、企业的各种变动成本、事故赔偿标准以及安全监管水平有关。
During short term, as the relationship between safety proof level and output, enterprise safety-working situation is related with coal price, variable cost, accident compensate and regulation level.
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