The theories of the law of one price and purchasing power parity are thought to hold almost exactly in financial market, but it seems less likely to occur in international trade where arbitrage opportunities take place. The purpose of this study is to test whether the purchasing power parity holds for commodities in various national markets, for which a quantitative method is followed. For identical goods, the prices should be equal across countries. In fact, the prices vary significantly across ‘truly homogenous’ goods within a product group. The finding suggests that differences in productivity and value-added tax do have significant positive impacts on price settings. As a consequence, purchasing power parity definitely does not prevail as well as law of one price does not. Further studies can use these findings to examine the extent and permanence of violations of the law of one price.