2026-10-27 · 新浪财经要闻 · 中文来源
开盘：主力合约跌多涨少 烧碱跌超4%
可以写进 IB、A-Level、AP、IGCSE 经济学论文的真实新闻案例：供求与价格、企业成本、利润与决策
发生了什么
10月27日国内商品期货早盘开盘，主力合约跌多涨少，烧碱跌超4%，棕榈油、苯乙烯、纯苯跌超2%，PVC、焦煤、棉花、豆油跌近2%；沥青涨超3%，LPG、甲醇、碳酸锂等上涨。
经济学角度
期货价格由买卖双方对未来供需的预期共同决定：烧碱等品种跌幅居前，说明市场对这些商品的供给相对充裕或需求预期走弱，卖方愿意以更低价格成交，均衡价格下移。对使用这些原料的企业而言，价格下跌意味着投入成本下降，可能改善利润空间。
可以引用的数据
- 烧碱跌超4%
- 棕榈油、苯乙烯、纯苯跌超2%
- 沥青涨超3%
评估角度
期货价格只是对未来供需的预期信号，并不等于现货价格立即同幅变动；下跌也可能来自投机资金撤离或短期情绪，而非真实供需变化，因此判断企业成本与利润时还需结合现货与库存数据。
练习题
结合材料，运用供需理论分析烧碱等商品期货价格下跌的可能原因及其对下游企业成本的影响。
阅读原文 ↗
对应考纲
- 供求与价格：某个市场的需求或供给变化，如何改变均衡价格和数量。
- 企业成本、利润与决策：企业如何根据成本、收入和竞争决定产量、价格和投资。
English version
What happened
On 27 October, domestic commodity futures opened with most main contracts falling: caustic soda dropped more than 4%, palm oil, styrene and pure benzene fell over 2%, and PVC, coking coal, cotton and soybean oil fell nearly 2%; asphalt rose over 3%, with LPG, methanol and lithium carbonate also gaining.
The economics
Futures prices are set by buyers' and sellers' expectations of future supply and demand: the sharp falls in caustic soda and other contracts suggest markets expect ample supply or weaker demand, so sellers accept lower prices and the equilibrium price shifts down. For firms using these inputs, lower prices mean lower costs and potentially better margins.
Figures to quote
- caustic soda fell over 4%
- palm oil, styrene and pure benzene fell over 2%
- asphalt rose over 3%
Evaluation
Futures prices are expectations about future supply and demand, not immediate spot prices; falls may also reflect speculative money leaving or short-term sentiment rather than real changes, so judging firms' costs and profits requires spot and inventory data too.
Practice question
Using the supply and demand model, explain possible reasons for the fall in caustic soda and other commodity futures prices and discuss the effect on downstream firms' costs.