War interrupted old promises
War spending sharply increased financing needs while uncertainty raised demand for gold and cash. After 1914, many countries therefore limited or suspended note convertibility and gold movements. The gold standard revealed itself as a political commitment that could be altered in an emergency.
Governments combined taxation, borrowing and monetary finance in different proportions. Inflation and postwar burdens were not identical everywhere. Debts, changed prices and a redistribution of gold reserves nevertheless made a simple return to the prewar order difficult.
A fragile return in the 1920s
Some governments restored convertibility at old parities, others after devaluation, and others later. If a parity overvalued the currency relative to domestic prices, defending it required high interest rates, downward pressure on wages and weaker demand. Gold reserves were unevenly distributed and cooperation had limits.
The interwar arrangement was not simply the stable nineteenth-century system restored. It relied more heavily on foreign-exchange reserves, central banks and postwar political commitments. War debts, reparations, capital movements and distrust weakened its resilience.
- a restored parity could be too high relative to domestic prices
- gold outflows pushed countries towards tighter credit
- one country's policy could transmit deflation to trading partners
The Great Depression did not have one cause
The Great Depression began in the United States in 1929 and involved collapsing output and prices, unemployment, a stock-market crash, banking panics and international financial shocks. Historians and economists debate the weight of monetary policy, bank failures, debt, demand, trade and structural weaknesses. An honest account does not reduce it to one event.
The commitment to defend gold nevertheless made it harder for several countries to lower rates and supply liquidity. Leaving gold created more room for monetary action, although it did not by itself repair every bank or social harm. US banking crises peaked between 1931 and 1933, and Roosevelt's 1933 measures changed domestic gold rules.
What can—and cannot—be inferred for Bitcoin
Bitcoin's issuance rule cannot be suspended by a government order unless economically relevant network participants accept the change. That differs sharply from a legal promise of convertibility. It does not mean an economy using Bitcoin would have no debt, banks, falling prices or financial panic.
The claim that Bitcoin would automatically have prevented the Great Depression is an untestable counterfactual. History more cautiously shows that a fixed monetary anchor can provide discipline and impose adjustment costs, while credit institutions can become fragile under any reserve asset.