In "Is mediocrity intelligent?" I talked about the importance of a diversity of strategies — even apparently "wrong" ones — to the long-term survival of a species. The corollary of course is that overinvestment in any single strategy can be catastrophic.

We see this issue at play in modern agribusiness.

As Popular Science informs us,

The 1923 musical hit "Yes! We Have No Bananas" is said to have been written after songwriters Frank Silver and Irving Cohn were denied in an attempt to purchase their favorite fruit by a syntactically colorful, out-of-stock neighborhood grocer.

It seems that an early infestation of Panama disease was already causing shortages in 1923. But the out-of-stock bananas in question were not the Cavendish variety we all eat today; they were Gros Michel ("Big Mike") bananas, and they were all that American banana lovers ate until the 1950s, when the disease finally finished them off.

I would love to know what a Gros Michel banana tastes like. I’m a big fan of bananas and eat them every day. (Actually, I drink them, blended into smoothies.) But the reason I only know the taste of Cavendish — and the reason you do too, unless you’re old enough to have had some Gros Michel mixed into your pablum — is that Cavendish bananas are resistant to the strain of disease that wiped out our original bananas. We have to assume that the Plan B bananas we now enjoy are only second best as far as flavor goes. They may not even be first best at survival, because the banana industry is searching for a Plan C banana to take the place of the Cavendish once the inevitable crop disease sends it the way of the Gros Michel — something that they predict will happen in the next decade or two. (See Banana: The Fate of the Fruit That Changed the World by Dan Koeppel.)

Why are bananas so vulnerable to these blights? Why aren’t agricultural scientists worried about our other favorite fruits — apples, for example?

Because there are many different types of apples. I’m dizzied by the variety at our local produce warehouse.

But not only is there just the one type of banana at the green grocers and in supermarkets; each banana you’ve probably every eaten is a clone of every other banana you’ve eaten. One genetic pattern manifested billions of times over, across millions of households in the past half century. And each Gros Michel was a clone of every other one, too. That’s because bananas reproduce asexually (as do potatoes, another food that’s especially vulnerable to disease — remember the Irish potato famine?).

Cavendish DNA is different enough from Gros Michel DNA that the disease that targeted the one species was no threat to the other. But any infection that can kill one Cavendish plant can wipe out the worldwide supply.

There are many reasons food activists attack Big Agribusiness — some good, some bad, and some wacky. One criticism that seems eminently reasonable to me is a concern that Big Agra puts all its billions of eggs in one giant basket.

Once upon a time, genetic diversity in farm products was built into how farming took place. Farmers farmed local land with local genetic strains of plants and animals. Chickens may have come from Asia, and Europe never saw a tomato until the Spanish brought some back from the New World, but even as trade began to go global several centuries ago, the limits of transportation and technology meant that gene pools could be local and diverse in a way that is much harder in our era of global overnight shipping and transnational corporate bureaucracies.

If an infestation wipes out the Golden Delicious, I can eat Fugi apples instead. But if the Cavendish disappears tomorrow, there isn’t yet a different banana to take its place.


Do you remember in my earlier post when my professor presented to the "artificial life" department at Bell Labs? In the context of a communications-research lab, artificial life was about using the lessons of biology, ecology, and evolution to make telephone networks more robust.

You may think that agriculture is more "natural" than phone switches and fiberoptics, but farming often short-circuits nature’s mechanisms to suit our short-term goals. One of the main such strategies of nature is diversity. And as I tried to illustrate with the concept of the genetic deme and the relativity of fitness, diversity means that what looks like an inferior strategy today could turn out to be the salvation of the species tomorrow.

As Larry Reed wrote recently in the Freeman,

Statists those who prefer force-based political action over spontaneous, peaceful, and voluntary initiatives — excel at distilling their views into slogans. ("A Slogan Worth Your Bumper?")

But what I find revealing is the contradictions at play in the juxtaposition of different bumper stickers on the same car. (And when you see a whole bunch of bumper stickers on the same car, odds are you’re driving behind a left-wing statist.)


This past weekend, at a red light, I was behind a minivan that brandished three bumper stickers:

One said, "Women for Obama."

If that wasn’t enough to declare the driver’s politics, the next bumper sticker made the claim that strong public schools create strong communities.

The last bumper sticker advised us in rainbow colors to "Celebrate Diversity!"

(Pop quiz: Are bumper stickers #2 and #3 in accord or at odds?)

Now, it’s a standard complaint against leftists that they talk diversity while pushing ideological conformity. Political correctness, and all that.

But to me the greater irony is that the Left consistently pushes centralization. Eat local, buy local, but decide everything in Washington DC.

I know that there are left-wing decentralists, and perhaps they genuinely do see the important parallels between genetic diversity and political federalism, between local communities and local authority. But I keep thinking of a story Tom Woods tells of his attending a decentralist conference back in the 1990s, where he happily discovered like-minded activists from both Left and Right. But to the apparent delight of the left-wing so-called decentralists, the highlight of the event was the keynote speaker: Vice President Al Gore.

BananaBookNo, in my experience, the vast majority of people with Buy Local bumper stickers, as with the Celebrate Diversity crowd, are also often, e.g., Women for Obama — that is to say, champions of ever-more-centralized authority. I’m confident that the driver in front of me at the intersection saw no irony in celebrating diversity while advocating strong public schools — and an even stronger central government.

But in the biosphere, where diversity rules, order is spontaneous. That spontaneous order is both the cause of and the result from overwhelming diversity. There are no central strategies in evolution, only in the human world, and only in recent human history. Evolution gave the natural world hundreds of varieties of banana. The United Fruit Company (hardly a free-market firm, by the way) gave us only one.

[Cross-posted at]