World War I and Global Equity Markets (1914–1918)

The First World War triggered the most severe disruption to global financial markets in modern history. For the first time, every major stock exchange in the world closed simultaneously, and the conflict fundamentally reshaped the international financial system.

Pre-War Financial System

Before 1914, global finance operated under the classical gold standard. Capital flowed freely across borders, London served as the undisputed centre of world finance, and stock exchanges in Europe and North America were deeply interconnected. The prevailing wisdom held that economic interdependence made a major European war impossible — or at least very short.

The Crisis of July–August 1914

The assassination of Archduke Franz Ferdinand on 28 June 1914 initially caused only modest market reactions. But as the diplomatic crisis escalated through July, panic selling began:

• Vienna: The Vienna Bourse closed on 27 July, the day before Austria-Hungary declared war on Serbia
• Continental Europe: Paris, Berlin, St Petersburg, and other exchanges closed between 28–31 July
• London: The London Stock Exchange closed on 31 July 1914 for the first time since its founding in 1801, and did not fully reopen until January 1915
• New York: The NYSE closed on 31 July 1914 and did not reopen for regular trading until 15 December 1914 — the longest closure in its history

The closures were driven by a rush to liquidate foreign holdings and convert assets to gold, threatening to drain gold reserves from every belligerent nation.

Wartime Market Performance

Once exchanges reopened, wartime markets told a complex story:

United States

The US market, initially battered by European selling, became the great beneficiary of the war. American industrial companies supplying the Allies saw enormous demand. The Dow Jones Industrial Average rose roughly 43% between December 1914 and the end of 1916, fuelled by war orders for munitions, steel, and agricultural products.

United Kingdom

British equities recovered modestly after reopening but were constrained by capital controls, excess profits taxes, and the diversion of capital to war bonds. The government actively discouraged equity speculation to channel savings into gilt-edged securities.

Germany

The Berlin Borse operated under severe restrictions. The government imposed minimum prices to prevent panic selling and used the exchange primarily as a vehicle for war bond distribution. Real returns for German equity investors were devastated by wartime inflation.

Neutral Countries

Neutral nations like the Netherlands, Switzerland, and the Scandinavian countries saw their stock markets benefit from trade with both sides, though submarine warfare and trade disruptions created volatility.

Lasting Financial Consequences

1. End of the gold standard: The classical gold standard collapsed as belligerents suspended convertibility to finance the war. It was never fully restored.
2. Shift of financial power: New York replaced London as the world's primary capital market. The United States went from being the world's largest debtor to its largest creditor.
3. Sovereign debt explosion: War debts and reparations created a web of international obligations that destabilised the 1920s and contributed to the Great Depression.
4. Birth of modern capital controls: Governments discovered they could direct capital flows during wartime and were reluctant to give up this power afterward.
5. Regulatory precedents: Emergency market closures, short-selling bans, and price controls established precedents that would be invoked in every subsequent crisis.

Lessons for Market Behaviour

World War I established several patterns that would recur in every subsequent conflict:

• Markets react most violently to escalation uncertainty, not to the conflict itself
• Exchange closures can prevent panic but create pent-up selling pressure
• War suppliers outperform, while companies dependent on international trade suffer
• Government bonds compete with equities for capital during wartime
• The post-conflict recovery can be rapid for the winning side but devastating for the losers

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Part of the Conflicts and Equity Markets article cluster.