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My latest Guardian column is about positive externalities, the value that bystanders get from the stuff you’re already doing:

That’s the crux of this irrational fear of positive externalities: “If something I do has value, I deserve a cut.” It’s one thing to say that someone who hires you to do a job, or purchases your product, should pay you money. But positive externalities are the waste-product of something we were already going to do. They’re things that you have thrown away, that you have thrown off, that you have generated in the process of enjoying yourself and living your life.

The mania to internalise your positive externalities is the essence of cutting off your nose to spite your face. I walk down the street whistling a jaunty tune because I’m in a good mood — but stop as soon as I see someone smiling and enjoying the music. I keep my porchlight on to read by on a warm night, but if I catch you using the light to read your map, I switch it off, because those are my photons — I paid for ’em!

Worse still: the infectious idea of internalising externalities turns its victims into grasping, would-be rentiers. You translate a document because you need it in two languages. I come along and use those translations to teach a computer something about context. You tell me I owe you a slice of all the revenue my software generates. That’s just crazy. It’s like saying that someone who figures out how to recycle the rubbish you set out at the kerb should give you a piece of their earnings. Harvesting positive externalities involves collecting billions of minute shreds of residual value – snippets of discarded string –and balling them up into something big and useful.

If every shred needs to be accounted for and paid for, then the harvest won’t happen. Paying for every link you make, or every link you count, or every document you analyse is a losing game. Forget payment: the process of figuring out who to pay and how much is owed would totally swamp the expected return from whatever it is you’re planning on making out of all those unloved scraps.

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