Japan Is Losing a Third of Its Population and the Yen Is Paying for It

Japan's economy has been running into a demographic ceiling for years, and the currency is where the pressure shows up. Japan's population decline is the structural constraint underneath the yen, with the population expected to shrink by more than 30% over the next three to four decades and the arithmetic leaving almost no room for real growth. That limit shapes how much freedom the Bank of Japan has when it has to choose between defending the currency and defending the bond market. Dollar yen is up more than 50% over five years, and because the yen carries 13.6% of the DXY basket, the dollar's resilience rests on that single move far more than most exposure calculations assume.

James Stanley is a Senior Strategist at StoneX Media, with a career in markets that began with equities in 1999 and expanded into options, fixed income and foreign exchange. He works across price action and macroeconomics on medium-term time frames, which is where currency moves driven by structural conditions rather than single policy decisions tend to surface.

Key Themes

• Japan's population is expected to decline by more than 30% over the next three to four decades.
• A 33% population reduction requires GDP per capita to rise 50% just to keep output flat.
• Rising Japanese long dated yields and domestic inflation pressure the Bank of Japan toward action on the yen.

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Japan's Population Decline Caps Real Growth Before Policy Begins

"If you look at the Japanese population, it's expected to decline by 30 plus percent over the next 30 to 40 years", and that single figure sets the ceiling on everything downstream. Japan's aging population is moving out of the workforce and onto entitlements, leaving a smaller worker base to produce the output the country needs. The arithmetic behind Japan's decline is unforgiving, and Stanley spells it out, "if you have a 33% reduction in your population to keep GDP flat over a 30 year period, you need GDP per capita to rise by 50%". That is what standing still costs rather than growing, which is why the Japanese yen has been absorbing a structural condition rather than a policy error.

Yen Weakness Boosts Japanese Exports and Mirrors Washington's Aim

Japan's currency weakness is not purely accidental, and the export benefit is the same one the United States has been openly seeking. A weaker yen makes Japanese goods cheaper for foreign buyers, which is the aim Washington states openly and Tokyo pursues in practice. According to Stanley, "it's essentially a beggar thy neighbor currency strategy or economic strategy", with the Japanese electorate backing whoever offers a new plan after a long stretch of slow to no growth. Consequently, the yen's decline carries political support in Tokyo even as it builds the imported inflation problem that eventually forces the Bank of Japan's hand.

Rising Japanese Yields Push the Bank of Japan Toward Action

Japanese long dated yields have been rising as domestic inflation climbs and investors sell Japanese government debt, and that combination is the constraint policy cannot ignore. The Bank of Japan and the Ministry of Finance want a controlled decline rather than a disorderly one, because a fast move raises the risk of inflation running away and takes the rate decision out of their hands. Japanese inflation sits at 1.9% against 3.4% in the United States, yet the Bank of Japan is the one rumored to move first, which shows the pressure stems from the bond market rather than the consumer basket. Stanley frames the likely response bluntly, saying "there may be a need for Japan to coerce some yen strength at some point in the not too distant future".

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--- Written by Gus Farrow, Senior Manager, StoneX Media

--- Expert: James Stanley, Senior Strategist, StoneX Media