Market reforms implemented in Poland, especially broader openness to international trade, should result in increasing price integration between Polish and world markets for such internationally traded commodities like wheat. However, in a period of economic transformation, Polish agricultural prices have been very volatile which led to government intervention in the market. Mainly because of such practises, Polish monthly wheat prices were found, using regression and cointegration analysis, to be generally unrelated to selected world prices over the period of 1990/91 through 1996/97. The intervention also caused such market distortions as deviations of prices from a normally expected seasonal pattern.