Seasonality and spatial integration in agricultural (product) markets
将季节性成分纳入基于协整分析的“一价定律”检验方法，并应用于欧盟五个成员国的软质小麦市场，发现部分市场整合而部分未整合，结果与忽略季节单位根的检验不同。
The recent testing approaches of the 'Law of One Price' which are based on co-integration analysis are modified by incorporating the seasonal components of the agricultural price series into the testing procedure. Application of the modified testing approach to the soft wheat market of five European Union member states produces mixed results as some of the markets turn out to be integrated while in some cases a unified market cannot be assumed. These results differ in some cases from those obtained by co-integration tests which ignore seasonal unit roots. © 1999 Elsevier Science B.V. All rights reserved.