National governments and central banks hold significant responsibility for shaping currency policies and influencing currency values. However, the dynamics of the global forex market, the complexities of international trade, and the need for consensus among multiple countries often limit their ability to intervene or manipulate currency rates regularly.

In the United States, the Department of the Treasury is legally mandated for all currency matters, while the U.S. Treasury secretary serves as the primary spokesperson for the U.S. dollar. When the Treasury secretary speaks on the value of the dollar, the foreign exchange (forex) markets pay close attention due to the dollar's pivotal role in the global economy.

The Eurozone, on the other hand, operates under the responsibility of the European Central Bank (ECB), which handles both monetary policy and currency matters. The ECB's governing council, comprising the presidents of participating nations' central banks, plays a crucial role in making policy decisions and communicating the Eurozone's stance on the euro's value. Although individual European countries may exert influence over currency policy through their finance ministers, consensus among member states is essential to effect any significant changes in the euro's value.

Japan's Ministry of Finance (MOF) holds responsibility for currency matters in the country. Given Japan's export-oriented economy, the value of the Japanese yen (JPY) is crucial for maintaining export competitiveness and corporate profitability. The MOF and the Bank of Japan (BOJ) frequently monitor JPY's exchange rate against other major currencies and may intervene in the forex market to manage excessive currency strength or weakness.

The United Kingdom's currency matters are overseen by the Chancellor of the Exchequer and the governor of the Bank of England (BOE). Both entities closely monitor the value of the British pound, particularly against the euro, as the bulk of UK trade is conducted with Eurozone countries.

Switzerland, with its heavily export-dependent economy, places great importance on the value of the Swiss franc (CHF). The Swiss National Bank (SNB) is responsible for managing the CHF's exchange rate, especially against the euro, as about 80% of Swiss trade is with Eurozone nations. The SNB may intervene in the forex market, as demonstrated by its pegging of the EUR/CHF rate at 1.20 in the past.

In summary, governments and central banks play vital roles in shaping currency policies, but their ability to influence currency values is often constrained by market forces, international trade dynamics, and the need for consensus among multiple nations. Closely monitoring central bank communications and official currency policies is essential for understanding potential shifts in currency values and their implications for financial markets.