Bank of Japan

• 1. Introduction

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  The Bank of Japan sits at the center of one of the world's most unusual monetary experiments. Its headquarters occupy the former site of a gold mint in Nihonbashi, Tokyo, a fact that feels less like coincidence and more like a declaration. The bank manages Japan's money supply, issues every banknote in circulation, and holds enough domestic stock to be the single largest owner of Japanese equities since 2020. But how did a feudal archipelago of incompatible currencies become a nation with a single, powerful central bank? And why has that bank spent decades battling deflation with tools no one had ever tried before?

• 2. From Feudal Mints to a Single Bank

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  Before the Meiji Restoration, Japan's feudal fiefs each printed their own money, a currency called hansatsu, in denominations that had no standard relationship to one another. Trade across regional borders was a daily exercise in confusion. The New Currency Act of Meiji 4, in 1871, ended this fragmentation by establishing the yen, pegged at parity with the Mexican silver dollar.

  The former fiefs, now reorganized as prefectures, saw their local mints converted into private chartered banks. For a period, both the central government and these so-called national banks issued money in parallel. That dual system was messy, and Finance Minister Matsukata Masayoshi proposed a solution in March 1882: a single central bank. The Bank of Japan Act was enacted, and the institution was formally founded that year.

  The model Matsukata drew on was the National Bank of Belgium, founded in 1850, which was regarded as one of the best-designed central banks in Europe at the time. By 1883, all national banks had been stripped of their banknote issuance privilege. The Bank of Japan received a monopoly on controlling the money supply in 1884. It would take another twenty years for all the old notes to be retired from circulation.

• 3. Rats, Gold, and the First Banknotes

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  Following the passage of the Convertible Bank Note Regulations in May 1884, the Bank of Japan issued its first banknotes in 1885, the eighteenth year of the Meiji era. The debut run encountered at least one remarkable problem: the konjac powder mixed into the paper to deter counterfeiters turned out to make the bills attractive to rats, who ate them. Despite this, the issuance was considered largely successful.

  Japan joined the gold standard in 1897, anchoring the yen to the metal that its Tokyo headquarters once processed in its former life as a gold mint. In 1899, the remaining national banknotes were formally phased out, completing a transition that had taken nearly three decades.

  By the early twentieth century, the bank's governor had acquired a symbolic weight that went beyond monetary policy. Takahashi Korekiyo, who served as governor beginning in 1911, described the position as that of the number-one representative of the business world in Japan's institutional system. That phrase captured something real about the bank's dual identity as a private-sector institution that nonetheless worked in close coordination with, and often took direction from, the Ministry of Finance.

• 4. War, Occupation, and Restructuring

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  On the 24th of February 1942, the wartime government promulgated a new Bank of Japan Act, which took full effect after the 1st of May 1942. The 1942 statute redefined the bank's purpose: where later legislation would focus on price stability and financial stability, the wartime provision stated the bank's objective in terms that served the imperial war effort.

  The bank's normal functions were suspended during the Allied Occupation of Japan that followed the war. Military currency was issued in its place. In 1949, the institution was restructured again.

  Decades later, the 1998 revision of the Bank of Japan Act formally replaced the wartime framework. It defined the bank's objectives as price stability and financial system stability, and affirmed operational independence from the government, specifically from the Ministry of Finance. The 1997 revision that preceded it was designed to give the bank greater independence, though critics argued the bank had already operated with excessive independence before that law passed. Article 4 of the revised act preserved a specific obligation: the bank was required to maintain close contact with the government, exchange views sufficiently, and ensure that its monetary policy and the government's economic policy remained harmonious.

• 5. Bubble, Bust, and Zero

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  When the Nixon shock arrived in August 1971, the Bank of Japan kept the yen fixed at 360 yen to the dollar for two more weeks, generating excess liquidity. The bank then held to the Smithsonian rate of 308 yen to the dollar and continued monetary easing until 1973, producing inflation that rose above ten percent. To rein in stagflation, the bank raised its official rate from 7% to 9%, and prices gradually stabilized by 1978.

  The bank's credit control division, headed during the bubble years from 1986 to 1989 by Toshihiko Fukui, later became deputy governor in the 1990s and governor in 2003. The credit controls that division administered were the primary tool of Japan's monetary policy through at least 1991. They worked by imposing bank credit growth quotas on commercial banks, and they were instrumental in creating the asset bubble of the 1980s.

  After the Plaza Accord of 1985, the yen strengthened sharply. The yen-to-dollar rate moved from 240 to 200 by the end of 1985, then fell further to 160 in 1986. To prevent deflation, the bank cut its official rate in a series of steps through 1986, reaching 2.5% after the Louvre Accord of February 1987. The bank held that rate until May 1989. The financial and fiscal climate that followed led to widespread over-valuation of real estate and stocks. After 1990, both markets collapsed, and the bank regulated markets through 1991 to wind down the bubble.

  The Great Hanshin earthquake in January 1995 sent the yen surging to 80 yen per dollar. The bank cut its rate to 0.5%, and deflation set in. By 1999, the Bank of Japan had introduced a zero-interest-rate policy, the first of a series of unconventional tools it would deploy over the following decades.

• 6. Unconventional Tools

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  Japan's economic bubble burst again in 2001, and the bank responded in March of that year by adopting quantitative relaxation policy, shifting its main operating target to the balance of current accounts held by banks at the BOJ. From 2003 to 2004, the Japanese government conducted foreign exchange intervention on a large scale, and the economy recovered substantially. In March 2006, the bank ended quantitative easing, and in June raised its rate to 0.25%.

  During the 2008 financial crisis, the bank cut its uncollateralized call rate to 0.3% and introduced a supplemental policy for balances in current accounts. By December 2008, the rate had fallen again to 0.1%, and the bank began purchasing Japanese Government Bonds, commercial paper, and corporate bonds.

  In 2013, Governor Haruhiko Kuroda announced a qualitative and quantitative easing program, abbreviated QQE. Unlike prior quantitative programs, this one extended to riskier assets, including stocks and real estate investment trusts. The Bank of Japan became the largest single owner of Japanese stocks. In 2016, the bank added yield curve control to its toolkit and initiated a negative interest rate policy. Eight years of negative rates ended in 2024, when announcements of roughly 5% wage growth by Japan's largest companies gave the bank confidence to set a new short-term target range of 0 to 0.1%. In December 2025, the bank raised its short-term policy target to 0.75%, a thirty-year high, citing confidence that Japan was approaching its 2% inflation goal on a durable basis.

• 7. Architecture of the Institution

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  Architect Tatsuno Kingo designed the Tokyo head office in eclectic style beginning in 1890, completing it in 1896 under the direction of entrepreneur Shibusawa Eiichi. Tatsuno drew consciously on the architecture of the Bank of England and especially on the National Bank of Belgium's buildings in Brussels and Antwerp, linking the physical form of the institution to the European model that had shaped its governance from the start.

  After the 1923 Great Kanto earthquake, Tatsuno's former engineer and successor directed repairs to the building. In the 1930s, that successor designed extensions on the northern and eastern sides in the same eclectic style but using reinforced concrete. The eastern extension still stands. The northern extension was eventually replaced by a larger building designed in 1966 by Matsuda Hirata Architects, completed in 1973 with ten floors above ground and five below.

  Tatsuno also designed the bank's branch on Nakanoshima Island in Osaka, completed in 1903 and still in operational use after remodeling in 1982. His branch buildings in Kyoto, completed in 1906, and Otaru, completed in 1912, are now museums. The south annex to the Tokyo headquarters, erected between 1982 and 1984, houses the Currency Museum of the Bank of Japan and the bank's Institute for Monetary and Economic Studies, known as IMES.