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Hi Traders, scalpers,

i decided to write out some interesting facts about forex spot market trading in Japan.

From Rice Coupons to Mrs. Watanabe and the 160+ Yen Battles:

If you open a chart right now and slap on a set of Japanese candlesticks or an Ichimoku cloud, you are already using tools forged in Japan. Yet most traders who scalp USD/JPY during the Tokyo open have no idea just how wild Japan’s relationship with currency trading really is. We are talking about a nation where futures and technical analysis were invented centuries before the personal computer, where an army of retail housewives regularly went toe-to-toe with London hedge funds, and where the central bank still drops tens of trillions of yen in sudden market interventions to keep speculators on their toes.

Grab a coffee (or a canned Boss coffee if you are trading the Asian session). Since people keep asking in the daily threads how Japan became the undisputed heavyweight champion of retail FX, here is the complete, start-to-finish history of forex trading in Japan.

1. The Pre-History: Dojima Rice, Candlesticks, and the Birth of the Yen (1700s–1945)

Long before anyone uttered the word "forex," Japanese merchants had already figured out price action, liquidity, and margin. In the 1700s at the Dojima Rice Exchange in Osaka, merchants traded komekitte (rice warehouse receipts)—effectively the world’s first futures contracts. Out of that pit came Munehisa Homma, a rice trader from Sakata whose psychological insights into supply, demand, and market emotion evolved into the candlestick charts every FX platform defaults to today.

The currency itself arrived a century later. Following the Meiji Restoration, Japan needed to replace a chaotic patchwork of feudal clan paper money and silver coins with a modern, decimalized currency. The New Currency Act of 1871 officially gave birth to the yen (literally meaning "round object"), and the Bank of Japan (BOJ) opened its doors in 1882 to serve as the nation’s central monetary authority. Fast-forward a few decades to the late 1930s, and Tokyo newspaper journalist Goichi Hosoda was locking himself in a room with dozens of students calculating moving-average equilibria by hand—eventually publishing Ichimoku Kinko Hyo ("one-glance equilibrium chart"), the second pillar of Japanese technical analysis.

2. The 360-Yen Cage and the 1971 "Nixon Shock" (1949–1973)

After World War II, currency speculation in Japan was nonexistent because the exchange rate was bolted to the floor. In April 1949, under the postwar Bretton Woods framework and Allied occupation policy, the yen was pegged at an unwavering ¥360 to $1 USD. For more than two decades, Japanese manufacturers treated 360 as a law of nature, using that undervalued rate to rebuild an export powerhouse.

Even back then, tiny cracks of market liberalization were beginning to show. By the mid-1960s, as Japan prepared for IMF Article VIII status, the BOJ widened the permissible trading band around the par value from 0.5% to 0.75% and began executing its earliest interbank stabilization operations—with Tokyo handling roughly 70% of domestic interbank volume and Osaka accounting for nearly 30%. Strict capital controls remained in place, and ordinary citizens or manufacturing firms couldn't touch the interbank market directly; everything ran through authorized foreign exchange banks.

Then came Sunday, August 15, 1971—Monday morning, August 16 in Tokyo. US President Richard Nixon went on television, severed the US dollar's convertibility to gold, and slapped a 10% surcharge on imports to force West Germany and Japan to revalue their currencies. While European markets shut their doors, Tokyo authorities panicked and kept the foreign exchange window open for nearly two weeks. Commercial banks dumped billions of dollars onto the Bank of Japan at the old 360 rate before Tokyo finally relented and allowed a managed "dirty float". By December 1971, the Smithsonian Agreement reset the peg to ¥308 per dollar (a 16.88% revaluation), and by February 1973, the peg was abandoned entirely. The modern floating yen was born.

3. The 1985 Plaza Accord and the Bubble Economy (1985–1997)

If the 1970s introduced currency volatility to Japanese corporations, the 1980s turned USD/JPY into the center of global macro geopolitics. During the early 1980s, Federal Reserve Chairman Paul Volcker’s sky-high interest rates and President Ronald Reagan’s fiscal expansion sent the US dollar surging by roughly 26%, swelling America's trade deficit with Japan.

On September 22, 1985, finance ministers and central bank governors from the G-5 nations (the US, Japan, West Germany, France, and the UK) met secretly at the Plaza Hotel in New York and signed the Plaza Accord. Their explicit goal: crush the value of the US dollar through coordinated intervention.

The move was violent. The dollar dropped 4% the very Monday the deal was announced, and over the next two years, the greenback plunged roughly 40%. USD/JPY collapsed from around ¥240 prior to the meeting to roughly ¥120 by 1988. Terrified that a soaring yen (endaka) would hollow out Japanese exporters, the Bank of Japan slashed domestic interest rates and flooded the banking system with liquidity. That cheap money poured straight into Tokyo real estate and the Nikkei stock market, inflating the legendary late-1980s asset bubble—and when that bubble popped in 1991, Japan entered its infamous "Lost Decade" of stagnation and deflation.

4. The 1998 "Tokyo Big Bang" and the Rise of "Mrs. Watanabe" (1998–2007)

For retail traders like us, April 1, 1998 is Year Zero. That was the day Japan’s revised Foreign Exchange and Foreign Trade Act took effect as the centerpiece of Prime Minister Ryutaro Hashimoto’s "Financial Big Bang." Before 1998, currency exchange was monopolized by licensed banks for trade and travel. The 1998 reform abolished the authorized-bank monopoly and legalized retail foreign exchange margin trading for individual citizens.

Look at the macro setup Japanese households faced at the turn of the millennium:

Domestic bank deposits paid virtually 0% interest as the BOJ cut rates to the floor and pioneered Quantitative Easing in 2001.

Real estate had crashed—dropping from 54% of household assets in 1990 on its way down toward 21% in later decades.

Domestic stockbrokers charged punishing fixed commissions (around 1.15% per retail trade until late 1999), and equity mutual funds charged 2% to 3% upfront just to buy in.

In Japanese culture, wives traditionally manage the household budget and savings. Refusing to let family savings rot in zero-interest bank accounts, millions of Japanese homemakers, retirees, and nighttime salarymen opened online margin FX accounts. The global financial press christened this collective retail force "Mrs. Watanabe" (a nickname originally coined by Euromoney in 1996 for Japanese household bond buyers before becoming synonymous with retail FX traders in the 2000s). Some became underground legends—including a Tokyo flower arranger who famously racked up over ¥400 million (roughly $4 million) in FX profits from home before getting busted for forgetting to declare it on her taxes.

How the Classic Mrs. Watanabe Carry Trade Worked:

Throughout the mid-2000s, Mrs. Watanabe mastered the yen carry trade. By going short the near-zero-rate yen and buying high-yielding currencies like the Australian Dollar (AUD/JPY), New Zealand Dollar (NZD/JPY), or British Pound ("Geppy" / GBP/JPY) on leverage of 100:1, 200:1, or even 400:1, retail traders collected daily positive swap payments (swap points) while riding a multi-year bull trend. In July 2005, the Tokyo Financial Exchange launched Click 365 (exchange-traded forex margin contracts), while online OTC brokers slashed spreads to fractions of a pip. Mrs. Watanabe grew so massive that her contrarian dip-buying regularly blunted institutional sell-offs, accounting for roughly 30% to 35% of all spot trading in pairs like AUD/JPY, NZD/JPY, EUR/JPY, and GBP/JPY in Japan.