Which factor is NOT known to influence foreign exchange rates?

Foreign exchange rates are influenced by various economic and political factors, and understanding these can help in analyzing trends and making decisions in international business. Interest rates are a significant factor as they can affect the flow of capital in and out of a country; higher interest rates tend to attract foreign investment, increasing demand for that country's currency. Inflation also plays a critical role because it affects purchasing power; generally, countries with lower inflation rates see an appreciation in the value of their currency relative to the currencies of their trading partners.

Political stability is another key factor; stable governments and predictability in economic policies attract foreign investment and can lead to an appreciation of a nation’s currency. In contrast, political turmoil can cause a lack of confidence in a currency, leading to depreciation.

Cultural practices, while they can affect international business interactions and relationships, do not have a direct influence on exchange rates in the way that the other factors do. Factors like cultural practices may shape consumer behavior and business strategies, but they do not directly affect currency valuation or the mechanics of foreign exchange markets. Therefore, cultural practices are the factor that does not impact foreign exchange rates as significantly as the others listed.