Transfer prices are significant for both taxpayers and tax administrations because they determine in large part the income and expenses, and therefore taxable profits, of associated enterprises in different tax jurisdictions. Transfer pricing issues originally arose in transactions between associated enterprises operating within the same tax jurisdiction. The domestic issues are not considered in these Guidelines, which focus on the international aspects of transfer pricing. These international aspects are more difficult to deal with because they involve more than one tax jurisdiction and therefore any adjustment to the transfer price in one jurisdiction implies that a corresponding change in another jurisdiction is appropriate. However, if the other jurisdiction does not agree to make a corresponding adjustment the MNE group will be taxed twice on this part of its profits. In order to minimise the risk of such double taxation, an international consensus is required on how to establish for tax purposes transfer prices on cross-border transactions.