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How predictable are prices of agricultural commodities? The possibilities and constraints of forecasting wheat prices

机译:农产品价格如何可预测?预测小麦价格的可能性和制约因素

摘要

Wheat price forecasts are very important for traders, farmers and politicians as well. However, only quite accurate price predictions can guide these groups towards making the best decisions. Therefore the well-known wheat price projections of both the OECD and the FAPRI from 1996 on are tested for their predictive accuracy using Theil's inequality coefficient. Despite the fact that both models could not foresee the price peak which occurred in February 2008, their predictions offer more accurate values than a naive prediction of no price change. Nevertheless, precise price forecasts cannot be expected by the models of the OECD and the FAPRI since some short-run effects such as inappropriate weather are not predictable. Thus, our own econometric model is developed taking the previous price development, the stocks-to-use-ratio and the crude oil price into account. In comparison to the projections of both institutions the model, with rather simple assumptions, was able to generate forecasts more accurately. In a simulation study which takes different crude oil price levels and stochastic effects of the world wheat consumption and the average yields per hectare into account, the possible wheat price range is shown as large. Therefore, price predictions can only inform about general longrun trends.
机译:小麦价格预测对贸易商,农民和政客也非常重要。但是,只有相当准确的价格预测才能指导这些群体做出最佳决策。因此,使用Theil的不平等系数对OECD和FAPRI自1996年以来的著名小麦价格预测进行了预测准确性的检验。尽管两个模型都无法预见到2008年2月出现的价格峰值,但与没有价格变动的天真预测相比,它们的预测提供了更准确的值。尽管如此,经合组织和粮食和农业政策研究所的模型无法预期精确的价格预测,因为某些短期影响,例如不适当的天气是不可预测的。因此,我们自己的计量经济学模型是在考虑了先前的价格发展,库存使用比率和原油价格之后开发的。与两个机构的预测相比,该模型在相当简单的假设下就能够更准确地生成预测。在一项模拟研究中,考虑了不同的原油价格水平和世界小麦消费的随机影响以及每公顷平均产量,该小麦可能的价格范围显示为很大。因此,价格预测只能告知总体长期趋势。

著录项

  • 作者

    Holst Carsten;

  • 作者单位
  • 年度 2010
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
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