Core Viewpoint - The article discusses the transformation of the international payment system against the backdrop of a rapidly changing global financial landscape, emphasizing the historical evolution of the international monetary system over the past 150 years and its reflection of shifts in global monetary power and technological frameworks [3]. Group 1: Gold Standard and Early International Payment System (Mid-19th Century to 1930s) - The gold standard established a stable and singularly anchored international payment system, with cross-border payments primarily relying on physical gold and credit instruments tied to it. London emerged as the global payment and clearing center, making the British pound the dominant currency for cross-border trade [5]. - Post-World War I, the gold standard faced severe challenges, leading countries to abandon it due to limited gold exports and rising trade protectionism. The Great Depression in the 1930s further diminished gold's role in cross-border transactions, transitioning it from a medium of exchange to a reserve asset, marking the end of the gold standard [5]. Group 2: Rise of Dollar Payments in the Bretton Woods System (1944-1971) - The Bretton Woods system established a "dollar-gold exchange standard," creating a multi-tiered anchoring structure of gold, dollars, and national currencies, with the dollar becoming the central currency for international payments. The U.S. strengthened its monopoly over the international payment system through control of key infrastructure like the Fedwire and CHIPS [7]. - To maintain system stability, G10 central banks intervened in the market through a "gold pool" and currency swap networks starting in 1961. However, increasing domestic inflation and pressures on foreign exchange and gold led to the U.S. unilaterally terminating its gold convertibility in 1971, resulting in the collapse of the system and the shift to floating exchange rates [7]. Group 3: Globalization of Payments under Floating Exchange Rates (1971-2008) - The floating exchange rate, capital liberalization, and financial innovation significantly expanded cross-border capital flows, necessitating a more efficient payment system. In 1973, SWIFT was established to connect global banks and enhance the speed and reliability of cross-border payments [9]. - By the early 2010s, SWIFT had nearly 9,000 member institutions across over 200 countries, becoming a cornerstone of global finance. The U.S. solidified its position as the international settlement center through Fedwire and CHIPS, while Europe developed TARGET for eurozone clearing. Despite the dominance of the dollar and SWIFT, challenges from the euro and emerging technologies began to rise [9]. Group 4: Diversification of the International Payment System Post-Financial Crisis (2008-2020) - The 2008 financial crisis highlighted the vulnerabilities of global dependence on the dollar, prompting many countries to explore autonomous and regional payment systems, leading to a new phase of turbulence in the global monetary system. The geopolitical implications of payment systems became more pronounced, especially after the West considered weaponizing SWIFT against Russia in 2014 [11]. - This situation spurred the development of alternative systems like Russia's SPFS and China's CIPS to enhance direct clearing capabilities for the yuan. Additionally, the rapid growth of e-commerce and mobile payments, along with the emergence of fintech companies like PayPal and Alipay, significantly reduced the costs of small cross-border payments, leading to the formation of new cross-border payment models. While the international payment system still relies on traditional infrastructures like SWIFT, the trends of regionalization and digitization have become increasingly prominent, driving rapid diversification and multipolarity in the international payment landscape [11].

Core Viewpoint - The dominance of the US dollar as the global reserve currency continues to pose challenges for other economies, despite the emergence of alternative currencies like the euro and the renminbi [2][3][4]. Group 1: Historical Context - The end of the Bretton Woods system in 1971 marked a significant shift, with the US unilaterally decoupling the dollar from gold due to persistent deficits and inflation [2]. - The dollar has maintained its status as the first true global reserve currency, unlike previous dominant currencies which were limited to their regions [5][6]. Group 2: Current Dollar Dominance - The US GDP accounts for approximately 25% of the global economy, yet the dollar represents over 40% of international trade and 60% of foreign exchange reserves [6][7]. - The deep liquidity of the dollar market facilitates its use as a vehicle currency, making it the preferred medium for international transactions [6][7]. Group 3: Challenges for Other Currencies - The euro, despite being the second-largest currency, struggles to achieve global status and is primarily used within Europe [12][20]. - Emerging markets have adopted managed floating exchange rate systems to mitigate volatility, learning from past financial crises [13][14]. Group 4: US Fiscal Concerns - The US faces significant fiscal challenges, with federal debt nearing 100% of GDP and projected to rise to 166% in 30 years under current policies [14][15]. - Political polarization hampers effective fiscal management, leading to a consensus of "deficits don't matter" among policymakers [15][19]. Group 5: Future of the Dollar - Concerns about the sustainability of the dollar's dominance are growing, with potential risks including higher interest rates and inflation [19][20]. - The renminbi's internationalization is ongoing, but significant barriers remain, including the need for capital account liberalization and legal market development [21].