There is nothing better than fuzzy language to wreak havoc – or facilitate consensus. Ludwig Wittgenstein argued that philosophical puzzles are really just a consequence of the misuse of language. By contrast, the art of diplomacy is to find language that can hide disagreement.

One idea about which economists agree almost unanimously is that, beyond mineral wealth, the bulk of the huge income difference between rich and poor countries is attributable to neither capital nor education, but rather to "technology.” So what is technology?

The answer explains the unusual consensus among economists, for "technology” is measured as a kind of "none of the above” category, a residual – Nobel laureate Robert Solow called it "total factor productivity” – that remains unexplained after accounting for other production inputs, such as physical and human capital. As Moses Abramovitz aptly noted in 1956, this residual is not much more than "a measure of our ignorance.”

So, while agreeing that technology underpins the wealth of nations sounds more meaningful than confessing our ignorance, it really is not. And it is our ignorance that we need to address.

In an important book, W. Brian Arthur defines technology as a collection of devices and engineering practices available to a culture. But devices can be put in a container and shipped around the world, while recipes, blueprints, and how-to manuals can be posted online, putting them just a few clicks away. So the Internet and free trade should make the ideas and devices that we call "technology” available everywhere.

In fact, much of modern growth theory, starting with Paul Romer’s research in the late 1980’s, sprang from the idea that output was driven higher by ideas that are hard to come by but easy to copy. That is why inventors have to be protected by patents and copyrights or subsidized by governments.

So, if ideas are easy to copy and devices are easy to ship, why do differences in "technology” persist between countries?

When something upsets a beneficent natural order, humans crave for stories featuring some malign force. For example, the argument in Daron Acemoglu and James Robinson’s book Why Nations Fail is essentially that technology does not diffuse because the ruling elite does not want it to. They impose extractive (bad) institutions, instead of adopting inclusive (good) institutions; and, because technology may upset their control over society, they choose to do without it.

As a Venezuelan who is seeing his country collapse at this very moment, I do not doubt that there have been many instances in human history during which those in power have prevented progress. But I am also struck by how often governments that embrace the goal of shared growth – post-apartheid South Africa is a good example – fail to achieve it.

CommentsView/Create comment on this paragraphSuch governments promote schooling, free trade, property rights, social programs, and the Internet, and yet their countries’ economies remain stuck. If technology is just devices and ideas, what is holding them back?

The problem is that a key component of technology is knowhow, which is an ability to perform a task. And knowhow, unlike devices and ideas, neither involves nor can be acquired through comprehension.

The tennis champion Rafael Nadal does not really know what it is that he does when he successfully returns a serve. He just knows how to do it; putting it in words is impossible, and any effort to do so would not make the rest of us better players. As the scientist and philosopher Michael Polanyi would say of such tacit knowledge, we know more than we can tell.

So we do not need extractive elites or other evil forces to explain why technology does not diffuse. Technology has trouble diffusing because much of it requires knowhow, which is an ability to recognize patterns and respond with effective actions. It is a wiring in the brain that may require years of practice to achieve. This makes its diffusion very slow: As I have argued previously, knowhow moves to new areas when the brains that hold it move there. Once there, they can train others.

Moreover, now that knowhow is becoming increasingly collective, not individual, diffusion is becoming even slower. Collective knowhow refers to the ability to perform tasks that cannot be carried out by an individual, like playing a symphony or delivering the mail: neither a violinist nor a letter carrier can do it alone.

Likewise, a society cannot simply imitate the idea of Amazon or eBay unless many of its citizens already have access to the Internet, credit cards, and delivery services. In other words, new technologies require the previous diffusion of other technologies.

Ricardo Hausmann, is a former minister of planning of Venezuela and former Chief Economist of the Inter-American Development Bank.