A single American state with 40 million people generates more annual economic output than the entire country of 124 million Japanese citizens. The two underlying populations involved in this comparison make the result substantially more anomalous than the headline numbers suggest. California’s resident population, by the most recent United States Census Bureau estimates, is approximately 39 million people. Japan’s resident population, by the most recent Japanese Ministry of Internal Affairs and Communications estimates, is approximately 123-124 million people. The Japanese population is therefore approximately 3.2 times the size of California’s. The Japanese workforce participation rate is approximately comparable to California’s. Japanese labour productivity, by every available comparative measure, is substantially above the OECD average and was, across the immediate postwar decades, widely cited as one of the more impressive single-country productivity stories in the recorded history of the modern industrial economy. The Japanese national economy was, as recently as 2010, the second-largest national economy in the world by nominal GDP, having surpassed the West German economy in 1968 and the Soviet economy in approximately 1989. The substantive fact that a single American state has now overtaken the entire Japanese national economic output represents, in essential respects, the cumulative consequence of approximately three decades of substantially different growth trajectories on opposite sides of the Pacific Ocean.
According to the official announcement issued by the Office of the Governor of California on the underlying IMF and BEA data, California’s economic growth rate across 2024 reached approximately 6 percent — substantially higher than the United States overall (5.3 percent), China (2.6 percent), or Germany (2.9 percent), and approximately ten times higher than Japan’s 2024 growth rate of approximately 0.1 percent. The substantive drivers of the California growth across the relevant period were essentially the same factors that have, for the better part of three decades, defined the broader California economic identity: the Silicon Valley technology sector (whose 2024 expansion was substantially driven by the artificial intelligence investment boom centred on companies like Nvidia, OpenAI, Anthropic, Google, and Meta, all of which are either headquartered in California or maintain substantial California-based operations), the Hollywood entertainment industry, the Central Valley agricultural sector (the largest single agricultural production region in the United States by output value), the broader Los Angeles and San Francisco financial-services sectors, and the substantial real-estate market across the state’s coastal cities. The cumulative California GDP per capita, calculated against the state’s 39-million-person resident population, exceeds approximately $104,000 — more than three times Japan’s GDP per capita of approximately $32,000.
Why Japan declined and California ascended
The Japanese side of the same comparison is, by every available measure of the underlying economic mechanics, substantially more troubling. As reported by the Japan Times’ Bloomberg-sourced coverage of the underlying GDP figures and their broader economic context, Japan’s nominal GDP was overtaken by China in 2010 (when Japan dropped from second to third place in the global ranking) and by Germany in 2023 (when Japan dropped from third to fourth). The April 2025 California comparison continues the same trajectory, dropping Japan from fourth to fifth place. The underlying causes of the Japanese relative decline have been extensively analysed in the economic literature across the past three decades: a declining and ageing population (Japan’s population has decreased by approximately 3 million people across the past 15 years and is expected to fall to approximately 88 million by 2065), substantially stagnant wages across multiple decades (real Japanese wages in 2024 were approximately at the same level as 1995), a substantial yen depreciation across 2022-2024 that mechanically reduced Japan’s GDP measured in US dollars by approximately 25 percent, and a broader Japanese policy preference for stability over growth that has produced, across the past 30 years, a substantially less dynamic economic environment than the comparable Anglo-American or Northern European economies.
The currency effect deserves specific note. As described in CNN Business’s coverage of the California-Japan economic comparison, the Japanese yen has depreciated approximately 30 percent against the US dollar between 2021 and 2024, falling from approximately 110 yen per dollar to approximately 155-160 yen per dollar. This depreciation does not represent an actual contraction of the underlying Japanese economy measured in domestic terms; it represents, in essential respects, a substantial revaluation of how that economy is measured against the dollar-denominated economies of the rest of the world. If the Japanese yen were to recover its 2021 exchange rate against the dollar, Japan’s dollar-denominated GDP would, mechanically, return to a level approximately equal to or above California’s. The April 2025 California-vs-Japan ranking is therefore substantially a function of currency exchange rates as well as of the underlying domestic economic trajectories — a complication that the headline ranking does not particularly emphasise but that economists tracking the comparison have repeatedly noted.
How long this lasted
The substantive question that the April 2025 ranking immediately raised was how long California’s fourth-place position would persist. The answer, on the basis of the subsequent 14 months of economic data, has been: not very long, and the rankings have moved several times since. Per Newsweek’s December 2025 reporting on India’s brief overtaking of California in subsequent IMF data, India’s nominal GDP reached approximately $4.18 trillion by late 2025, briefly placing India ahead of both California and Japan in the global ranking. The April 2026 IMF World Economic Outlook then complicated the picture further: a substantial depreciation of the Indian rupee across 2025 (from approximately 84 rupees per dollar to approximately 88 rupees per dollar) combined with a February 2026 statistical revision to India’s national accounts (which lowered the nominal GDP figure by approximately 4 percent) dropped India back to sixth place in the IMF’s April 2026 figures, behind a Japan that had — through the appreciation of the yen against the dollar across the same period — recovered some of its earlier dollar-denominated decline and reclaimed fourth place at approximately $4.38 trillion. The current (April 2026 IMF) global ranking is: United States, China, Germany, Japan, United Kingdom, India — with California’s $4.1-trillion figure from the April 2025 announcement no longer easily comparable to a national ranking that has itself been substantially rearranged. The single American state that briefly held the fourth-largest economy in the world, in April 2025, represents — in essential respects — a snapshot of a particular configuration of global currency markets and national accounting practices that the subsequent fourteen months have already substantially superseded. The substantive question California’s April 2025 moment actually answered was not whether a single American state could outproduce Japan in any permanent sense, but whether the global economic rankings that journalists and policymakers treat as relatively stable measurements of underlying economic reality are, in fact, substantially more volatile than the popular framing of those rankings tends to suggest.
The post In April 2025, the state of California officially surpassed Japan to become the fourth-largest economy in the world — a single American state with 40 million people generating more annual economic output than the entire country of 124 million Japanese citizens, behind only the United States, China, and Germany in the global ranking appeared first on Space Daily.