Transfer pricing refers to the prices charged for transactions between related parties. It is important for tax purposes as multinational groups can use transfer pricing to minimize taxes by shifting profits between jurisdictions with different tax rates. The arm's length principle requires transfer prices to be the same as if the parties were unrelated. There are several methods to determine appropriate transfer prices such as the market rate method, adjusted market rate method, and transactional net margin method which compares the profit of related party transactions to similar uncontrolled transactions. Factors that influence transfer pricing include tax rates, currency fluctuations, and regulations from bodies like the OECD.