for his absolutely brilliant insights into Economic History and Development. Arguably, he should share it with Jared Diamond, who really succeeded in popularizing Crosby's ideas and also added quite a bit himself. Although some might say that he could have cited Crosby a bit more than he did.
For it was Crosby, a historian by trade who decided he would look into the little-researched field of ecological history. Any grad student in Economic History/Development, or, scratch that, any grad student in economics, should go read at least one of Ecological Imperialism or The Columbian Exchange. The latter term, coined by Crosby, highlights the very unequal exchange of diseases and technologies between peoples of the old world and new. Europe got potatoes, corn, tomatoes, chocolate, and plastic. Native Americans got grains, livestock, bacon, and a whole host of vicious diseases which leveled their populations. The only disease to come from the Americas was perhaps syphilis, which is still debated.
Suppose you wanted to believe that Europeans had better institutions, and thus colonized the Americas rather than vice-versa. However, Crosby tells the story of when the first American settlers coming over the Appalachian mountains arrived in Kentucky, and thought that Kentucky blue-grass was a native plant. In fact, Crosby notes that Kentucky bluegrass actually is native to France. It arrived in the Americas aboard a ship, and just happened to colonize the continent even faster than humans. The same was true of European dogs, mice, rabbits, and bees. It would be bizarre to argue that rabbits had better property rights institutions, and thus colonized the Americas. And, given that human's colonization of the Americas was not unique, it seems wrong to focus on unique aspects of humans. Weeds, bugs, and various other animals pulled the same feat.
Here's an except from a Crosby essay:
Europeans in North America, especially those with an interest in gardening and botany, are often stricken with fits of homesickness at the sight of certain plants which, like themselves, have somehow strayed thousands of miles eastward across the Atlantic. Vladimir Nabokov, the Russian exile, had such an experience on the mountain slopes of Oregon:
Do you recognize that clover?
Dandelions, l’or du pauvre?
(Europe, nonetheless, is over.)
A century earlier the success of European weeds in American inspired Charles Darwin to goad the American botanist Asa Gray: “Does it not hurt your Yankee pride that we thrash you so confoundly? I am sure Mrs. Gray will stick up for your own weeds. Ask her whether they are not more honest, downright good sort of weeds.”
Why was the Columbian Exchange so unequal? Essentially it comes down to the large Eurasian landmass being a far more competitive ecosystem than the north-to-south oriented Americas (admittedly, Diamond deserves credit for noticing the difference in the axes of the continents). Any type of grass in the large Eurasian landmass that adopted a new, useful trait would come to dominate the entire continent, as much of it shared similar climate. By contrast, if a type of grass in New York has some new beneficial trait, it will be unlikely to spread to Mexico or northern Canada given the vastly different climates there. Thus, evolution would play out a little faster in Eurasia, as would technological progress among human societies. On the other hand, the distribution of useful large domesticable animals was probably just random. And this spurred the pandemic diseases.
Crosby notes that most European settlers ended up dominating the "Neo-Europes" -- areas of the world similar to Europe in terms of climate -- but much less so in the tropics. Many economists believe that institutions are the reasons the tropics are poor, or genetics. However, Crosby lays out another reason:
The reasons for the relative failure of the European demographic takeover in the tropics are clear. In tropical Africa, until recently, Europeans died in droves of the fevers; in tropical America they died almost as fast of the same diseases, plus a few native American additions. Furthermore, in neither region did European agricultural techniques, crops, and animals prosper. Europeans did try to found colonies for settlement, rather than merely exploitation, but they failed or achieved only partial success in the hot lands, The Scots left their bones as monument to their short-lived colony at Darien at the turn of the eighteenth century. The English Puritans who skipped Massachusetts Bay Colony to go to Providence Island in the Caribbean Sea did not even achieve a permanent settlement, much less a Commonwealth of God. The Portuguese who went to northeastern Brazil created viable settlements, but only by perching themselves on top of first a population of native Indian laborers and then, when these faded away, a population of laborers imported from Africa, They did achieve a demographic takeover, but only by interbreeding with their servants. The Portuguese in Angola, who helped supply those servants, never had a breath of a chance to achieve a demographic takeover. There was much to repel and little to attract the mass of Europeans to the tropics, and so they stayed home or went to the lands where life was healthier, labor more rewarding, and where white immigrants, by their very number, encouraged more immigration.
One of the big problems with both Acemoglu, Johnson, and Robinson's (AJR) work on development, and also with Spolaore and Wacziarg's QJE paper on genetic distance, is that they hadn't actually read, or properly internalized, the teachings of Crosby and Diamond. AJR argued that disease climate was a proxy for institutions and not geography, whereas clearly one might make a case that it's also a good proxy for climatic similarity. Areas of the world where European peoples died are also areas of the world where European crops and cattle also died. This was an insight that AJR missed. If Acemoglu got a John Bate's Clark for his work on institutions, then Crosby certainly deserves a Nobel.
Of course, there's more here. The insights of Crosby/Diamond don't end in 1500. First, history casts long shadows. But, aside from that, the world was largely agrarian even long after the Industrial Revolution in 1800. In Malthusian societies, agricultural technologies are very important. If you are a farmer in Angola, those new varieties of wheat, and farming technologies discovered in the American midwest in 1900, or even 1950, are not going to help you. If you live in Australia, the Southern Cone countries, or Europe, they will.
One thing that is fascinating is that, while the US is similar to Europe climatically, it's not 1-for-1. The US is much hotter and more humid in summer. The US south actually does share some similarities with Africa. And it was in the US where air-conditioning was invented. This technology almost certainly was more helpful than the tropics. (Note: I haven't turned on my AC all summer in Moscow, Russia!...) But, again, I see this as a Crosby/Diamond type of affect.
In any case, here's a nice interview of Crosby. Here's a short reading you can give to students. Here's Crosby's wikipedia page.
Alfred Crosby is now 86 years old! He deserves a real Nobel, much less the fake one awarded in Economics, and he deserves it sooner rather than later.
