Why Nations Fail: The Origins of Power, Prosperity, and Poverty

such as a city sewage system and street lighting.
    Moreover, there is evidence that there was also some economic growth under the Roman Republic. We can track the economic fortunes of the Romans from shipwrecks. The empire the Romans built was in a sense a web of port cities—from Athens, Antioch, and Alexandria in the east; via Rome, Carthage, and Cadiz; all the way to London in the far west. As Roman territories expanded, so did trade and shipping, which can be traced from shipwrecks found by archaeologists on the floor of the Mediterranean. These wrecks can be dated in many ways. Often the ships carried amphorae full of wine or olive oil, being transported from Italy to Gaul, or Spanish olive oil to be sold or distributed for free in Rome. Amphorae, sealed vessels made of clay, often contained information on who had made them and when. Just near the river Tiber in Rome is a small hill, Monte Testaccio, also known as Monte dei Cocci (“Pottery Mountain”), made up of approximately fifty-three million amphorae. When the amphorae were unloaded from ships, they were discarded, over the centuries creating a huge hill.
    Other goods on the ships and the ship itself can sometimes be dated using radiocarbon dating, a powerful technique used by archaeologists to date the age of organic remains. Plants create energy by photosynthesis, which uses the energy from the sun to convertcarbon dioxide into sugars. As they do this, plants incorporate a quantity of a naturally occurring radioisotope, carbon-14. After plants die, the carbon-14 deteriorates due to radioactive decay. When archaeologists find a shipwreck, they can date the ship’s wood by comparing the remaining carbon-14 fraction in it to that expected from atmospheric carbon-14. This gives an estimate of when the tree was cut down. Only about 20 shipwrecks have been dated to as long ago as 500 BC . These were probably not Roman ships, and could well have been Carthaginian, for example. But then the number of Roman shipwrecks increases rapidly. Around the time of the birth of Christ, they reached a peak of 180.
    Shipwrecks are a powerful way of tracing the economic contours of the Roman Republic, and they do show evidence of some economic growth, but they have to be kept in perspective. Probably two-thirds of the contents of the ships were the property of the Roman state, taxes and tribute being brought back from the provinces to Rome, or grain and olive oil from North Africa to be handed out free to the citizens of the city. It is these fruits of extraction that mostly constructed Monte Testaccio.
    Another fascinating way to find evidence of economic growth is from the Greenland Ice Core Project. As snowflakes fall, they pick up small quantities of pollution in the atmosphere, particularly the metals lead, silver, and copper. The snow freezes and piles up on top of the snow that fell in previous years. This process has been going on for millennia, and provides an unrivaled opportunity for scientists to understand the extent of atmospheric pollution thousands of years ago. In 1990–1992 the Greenland Ice Core Project drilled down through 3,030 meters of ice covering about 250,000 years of human history. One of the major findings of this project, and others preceding it, was that there was a distinct increase in atmospheric pollutants starting around 500 BC . Atmospheric quantities of lead, silver, and copper then increased steadily, reaching a peak in the first century AD . Remarkably, this atmospheric quantity of lead is reached again only in the thirteenth century. These findings show how intense, compared with what came before and after, Roman mining was. This upsurge in mining clearly indicates economic expansion.
    But Roman growth was unsustainable, occurring under institutions that were partially inclusive and partially extractive. Though Roman citizens had political and economic rights, slavery was widespread and very extractive, and the elite, the senatorial class, dominated both the economy and politics. Despite the presence of the Plebeian Assembly and plebeian tribute, for example, real power rested with the Senate, whose members came from the large landowners constituting the senatorial class. According to the Roman historian Livy, the Senate was created by Rome’s first king, Romulus, and consisted of one hundred men. Their descendants made up the senatorial class, though new blood was also added. The distribution of land was very unequal and most