历史案例凸显「neo-mercantilist」摩擦在21世纪再起，其逻辑可与17与18世纪重商年代（trade surplus被视为实力指标且伴随频繁战争）相互对照。1920—1930年代更是警示：第一次世界大战后US成为主要债权国，增加他国脆弱性；UK于1925年以战前平价重返gold standard引发通缩，Federal Reserve在Benjamin Strong影响下于1927年宽松，助长US股市与金融泡沫，1929年崩盘后又逢1930年Smoot-Hawley tariff，Great Depression期间Adolf Hitler于1933年出任德国总理，显示失衡、政策反应与地缘政治风险可相互放大。
文中并指出顺差国并非绝对强势：它们常面临内外压力扩大内需以缓和他国通缩，Japan在1980年代与China在2007—09金融危机后皆出现以刺激内需对冲外部压力、却形成不可持续房地产泡沫并破裂的模式；Germany在Eurozone危机中则在「资助伙伴」与「货币同盟碎裂」间选择前者，透过target balances使Bundesbank成为巨大债权人。相对地，赤字国虽可能被断供，但顺差经济（如China、Germany、Japan）仰赖对外需求消化可贸易品的过剩供给，突然失去赤字市场亦可能陷入衰退；然而多数新兴国因以外币负债而易在危机中缺乏「本币最后贷款人」能力，且IMF未必足以救援。Eurozone危机削弱其赤字国信用后，主要赤字承担者转向可用本币融资的US与（程度较小的）UK，使US成为全球收支的主要平衡者；但赤字常伴随国内负债扩张与可贸易部门弱化，进而在US引发政治反弹（如Donald Trump的关税战与Scott Bessent维持US Treasury需求的努力），作者因此警告在市场无法自动化解的脆弱金融条件下，持续失衡与US/UK「不具可持续性」的平衡角色可能把世界推向新一轮危机。
The article argues that global balance-of-payments imbalances recur with striking regularity—roughly every 20 years since the 1980s, with key precedents in the 1920s and the 1960s. The 1960s episode ended in the breakdown of the Bretton Woods system of fixed-but-adjustable exchange rates and the move to broadly floating rates (with the Eurozone as an exception), while the 1920s chain of failures ultimately helped motivate the 1944 creation of the Bretton Woods architecture and the IMF to manage imbalances. Imbalances are hard to manage yet pivotal because they sit at the junction of national power, employment, industrial capacity, financial stability, fiscal/monetary policy, and exchange-rate choices—thereby shaping international relations.
It frames today as a “neo-mercantilist” era, echoing the 17th and 18th centuries when trade surpluses were treated as measures of strength and geopolitical rivalry was frequent. The 1920s–1930s provide an extreme warning: after World War I the US became the dominant creditor, raising fragility abroad; the UK returned to the gold standard at prewar parity in 1925, producing deflation; the Federal Reserve, influenced by Benjamin Strong, eased in 1927, amplifying a US equity-and-financial bubble; the crash arrived in 1929, followed by the 1930 Smoot-Hawley tariff; amid the Great Depression, Adolf Hitler became German chancellor in 1933—illustrating how macro imbalances, policy reactions, and geopolitics can reinforce one another.
A central lesson is that surplus countries are not fully in control: pressure to expand domestic demand can reduce partners’ deflation but also fuel domestic bubbles, as seen in Japan in the 1980s and in China after the 2007–09 crisis, both followed by property-bubble busts; Germany faced a similar constraint in the Eurozone crisis and chose to finance partners, partly via “target balances” that made the Bundesbank a giant creditor. Deficit countries also have leverage because surplus economies (e.g., China, Germany, Japan) are structured around excess tradables supply and can slump if deficit demand disappears; yet many emerging borrowers rely on foreign-currency liabilities, making crises harder to backstop and leaving the IMF sometimes insufficient. After the Eurozone crisis impaired its deficit countries, the main deficit absorbers became the US and, to a lesser extent, the UK—able (so far) to borrow in their own currencies—so US deficits have become the principal offset to global surpluses; but persistent deficits tend to pair rising domestic indebtedness with weakened tradables production, feeding US political backlash (Donald Trump’s tariff wars and Scott Bessent’s efforts to sustain demand for US Treasuries) and raising the risk of further financially driven crises because markets will not automatically resolve such politically charged fragilities.