When bread cost 200 billion marks

On November 15, 1923, a loaf of bread in Berlin cost 200 billion marks. Two years earlier the same loaf had cost a few marks. The German mark had lost all its usefulness as money. People paid in bricks, in books, in labor, in anything that could be exchanged. Companies paid wages twice a day because the afternoon pay was worthless by evening. Children played with stacked blocks of banknotes. Waiters quoted restaurant prices by the minute.

This is the canonical case of hyperinflation, the one every central bank studies. The speed and totality of the Weimar collapse is what made it a reference point for monetary discipline for the next century. A country with a literate population, modern industry, and a functioning legal system lost the useful value of its currency in less than two years.

Where it started

Germany entered 1914 with one of the world's stronger currencies. The mark was pegged at 4.2 to the US dollar. To finance the First World War, the government suspended gold convertibility and funded the war effort by borrowing and by printing. By November 1918, when the armistice was signed, the mark had fallen to about 7 to the dollar. That was significant but manageable.

The Treaty of Versailles in 1919 assigned Germany reparations that were finalized in 1921 at 132 billion gold marks, payable over decades. The real number Germany was expected to actually pay was closer to 50 billion. Either way, the payments were denominated in gold or foreign currency, not in paper marks. To make them, Germany had to sell marks on international exchanges in exchange for gold, dollars, or pounds. Every month of reparations payments was another downward push on the mark.

The acceleration

Through 1921 and early 1922, the mark weakened from 75 to the dollar to 320. This looked alarming but was not qualitatively different from other post-war currency adjustments. What changed between mid-1922 and mid-1923 was the speed. By July 1922, the mark was at 493. By December, 7,590. By July 1923, 353,000. By August, 4.6 million.

The acceleration was driven by two linked mechanisms. The central bank, the Reichsbank, was effectively funding the government by printing money, because taxes were collected in marks whose value was evaporating faster than tax departments could assess and collect. By the time a tax assessment cleared, the mark value had fallen to a fraction of what it had represented when the assessment was calculated. The government's real expenses, however, were continuous. So the printing presses ran continuously.

At the same time, everyone holding marks was trying to get rid of them. Workers spent wages within hours. Companies stockpiled raw materials rather than hold cash. Velocity accelerated. Velocity is a technical term that means how many times the same unit of currency changes hands in a fixed period. Normally it is measured per year. In Weimar Germany by mid-1923 it was measured per day.

The Ruhr broke it

In January 1923, France and Belgium occupied the Ruhr valley, Germany's industrial heartland, to force reparations payments Germany had defaulted on. The German government responded with a policy of passive resistance: workers in the Ruhr would strike, the government would pay them. Paying hundreds of thousands of Ruhr workers out of a treasury funded only by printing was the trigger for the terminal phase of the inflation. Between January and November 1923 the mark fell from 17,900 to the dollar to 4.2 trillion.

In October 1923 a single postage stamp cost 50 million marks. Factory workers were paid in wheelbarrows of banknotes, often twice per day. People burned banknotes for warmth because they had become cheaper than firewood. A restaurant meal cost several billion marks, and the price on the menu at the start of the meal was different from the bill at the end.

How it ended

On November 15, 1923, the same day as the 200-billion-mark loaf, the government introduced a new currency called the Rentenmark. One Rentenmark was exchanged for one trillion old marks. The Rentenmark was nominally backed by a mortgage on all German agricultural and industrial property, not by gold. What actually mattered was that the government credibly committed to a fixed quantity: four billion Rentenmarks, no more printing. Within weeks the Rentenmark held its value. By April 1924, under the Dawes Plan, reparations were restructured into a schedule Germany could actually pay, and a gold-backed Reichsmark replaced the Rentenmark at par.

The inflation was over. The political damage was not. The German middle class had been wiped out. Savings, pensions, insurance policies, mortgages, anything denominated in marks was worthless. Families who had been comfortably bourgeois in 1918 were destitute by 1924 while also still being nominally rich in old-mark terms, a disorienting combination that produced sympathy for radical politics on both ends. Hitler's failed Beer Hall Putsch took place on November 8, 1923, at the peak of the inflation. He would come to power ten years later. The connection is well documented.

The mechanism, not the symbol

Weimar hyperinflation is often cited as the argument against any central bank that loses its discipline. This is partly right and partly a simplification. The mechanism was not central bank incompetence in isolation. It was a cycle in which a fiscal problem, reparations denominated in foreign currency, forced a monetary response, printing marks to buy foreign currency and to pay striking workers in the resulting vacuum, which forced more of both. The Weimar Reichsbank had technical independence. What it did not have was a government capable of producing balanced budgets under the constraints it faced.

The modern cases that follow this pattern, Zimbabwe in 2008, Venezuela in the mid-2010s, Argentina repeatedly, share the same structure. A fiscal commitment the state cannot honor in real terms meets a monetary authority that can print the nominal payment. The result is always the same shape. Japan's Lost Decade is the other end of the same spectrum: a central bank that could not push money into the economy even when it wanted to. The midpoint, where a central bank has credible commitment and fiscal authorities have credible discipline, is not a natural state. It is an engineered one, and it takes active work from both sides to maintain.