The Mongol Empire is remembered for its brutality, and rightly so. The terror was real, and the destruction was vast. But focusing only on the violence obscures a far more consequential story: the Mongols did not just conquer the world, they connected it. Under Genghis Khan and his successors, the vast trade networks of Asia were unified under a single administration for the first time in history.
The fragmentation of small kingdoms, warring tribes, and exorbitant local taxes that had strangled commerce for centuries was replaced by a single, relatively secure system. It was said that a woman carrying a sack of gold could travel from the Pacific to the Black Sea without being harmed. This period became known as the Pax Mongolica, a peace that laid the foundation for the first global economy. The Mongols built a sophisticated relay system called the *yam*, a network of stations spaced every 20 to 30 miles across the empire.
Riders carrying a golden tablet, or paiza, could swap for fresh horses at each stop and cover up to 200 miles a day. Information that once took months to travel now moved in days, allowing the Khan in his capital to know the price of grain in Baghdad before local governors did. This speed was the logistical backbone of the largest land empire in history. The Mongols were nomadic warriors, and many, including Genghis Khan himself, were illiterate.
But they understood what they did not know. They forcibly recruited the world’s best experts—accountants from Persia, engineers from China, goldsmiths from France—and placed them throughout the empire. This forced transfer of talent sparked a boom in technology and ideas, moving gunpowder, astronomy, and manufacturing techniques across continents. By the mid-1200s, trade was booming, but the Mongols faced a new crisis: a shortage of copper for coins.
The economy was growing faster than the physical money supply could support. Transporting heavy metal coins across the empire was becoming impractical. The solution to this crisis came from Kublai Khan, Genghis’s grandson, in the form of paper currency. Kublai Khan’s government created the *chao*, the world’s first true fiat currency.
It was made from mulberry bark and stamped with the royal seal. It was not backed by gold or silver; it was money because the Khan declared it so, and his authority was absolute. A grim warning on each note read, “Counterfeits will be decapitated. ” Marco Polo, who served in Kublai’s court, wrote with wonder that the Khan could seemingly create wealth from nothing.
For a time, the system worked brilliantly. The government could pay its armies and officials without mining a single ounce of copper, and merchants no longer had to haul heavy coin. Kublai funded massive public works, including extending the Grand Canal to his new capital, Dadu, and creating early relief systems for famine-stricken provinces. He also became a great patron of the arts and sciences.
However, the ease with which money could be created made it nearly impossible to stop spending it. Kublai, the most powerful man in the world, looked across the sea at Japan and decided he wanted it. The resulting invasions were among the most expensive military mistakes in history. In 1274, a massive fleet funded by printed money set sail for Japan.
A typhoon—which the Japanese called the *kamikaze*, or divine wind—destroyed it. Kublai ordered a second, larger fleet. It was destroyed by another typhoon. The wood, iron, grain, and labor that built those fleets were gone, but the paper notes used to pay for them remained in circulation.
Too much money was now chasing too few goods, creating classic demand-pull inflation. The spending did not stop with Japan. Kublai launched failed campaigns against Java and Vietnam. Each failure was an economic blow, and the Yuan government’s response was to print more money.
In 1287, they introduced a new note, declaring it worth five of the old ones, a devaluation that effectively robbed savers and merchants to pay for failed wars. Corruption exploded as finance ministers used their control of the printing press for personal enrichment. State monopolies were sold to cronies, and successful merchants had their goods confiscated. The public’s trust in the currency began to erode.
People started hoarding real assets—silver, copper, even pots—and trying to spend their paper money before it lost more value. This only accelerated the inflation. By the time Kublai died in 1294, the cracks in the system were visible. Prices were spiraling, and the common people who lived on fixed wages were suffering.
Still, the court remained confident it could print its way out of any problem. They were prepared for war and rebellion, but they were not prepared for a plague. By the 1340s, the paper money was nearly worthless. Vendors in Dadu refused to accept it, and the streets were littered with discarded notes.
The government’s response was to print ever higher denominations. Then the Black Death arrived. It traveled along the very trade routes the Mongols had built and protected, moving from Central Asia into the heart of China. Historians estimate the plague killed 30% to 50% of the population in some regions.
As people died, agriculture collapsed. Famine followed pestilence. The government’s tax base evaporated, yet the court’s response was to double down, passing decrees making it a crime to refuse paper money. But enforcement was impossible as soldiers and officials died alongside everyone else.
The suffering created fertile ground for rebellion. The Red Turbans, a religious sect blending Buddhist and Manichaean beliefs, rose up under the leadership of Zhu Yuanzhang, a peasant monk whose family had been killed by famine and plague. The demoralized Mongol army crumbled. When the rebels captured cities, they burned tax records and made bonfires of the worthless paper money.
By 1368, the last Yuan emperor, Toghon Temür, fled Beijing without a fight, retreating to the Mongolian steppe. The greatest land empire in history had lasted less than a century in China. Zhu Yuanzhang became the Hongwu Emperor, founding the Ming Dynasty. One of his first acts was to abolish paper money.
The trauma of hyperinflation was so deep that China would not fully trust paper currency again for nearly 500 years. The Ming Dynasty turned inward, closing borders, restricting trade, and rebuilding the Great Wall. The era of the Silk Road and global trade initiated by the Mongols was over. The lesson of the Yuan dynasty is stark: a state can print an infinite amount of money, but it cannot print value.
The Mongols built an economic miracle on trust, and when they abused that trust to fund endless wars and lavish courts, the miracle collapsed into hyperinflation, plague, and revolution. Genghis Khan conquered the world on horseback; his grandsons lost it with a printing press.