Software prices will eventually fall to zero. The open-source software movement has already started that commoditisation." That pronouncement came from MIT professor, Michael A. Cusumano, at a recent Silicon Valley conference called The New Software Industry.

If that sounds too good to be true to corporate IT shops that are forever squeezed by software costs, well, yeah, it is.

About a week earlier, I had dinner with open-source deep-thinker, Eric S. Raymond, author of The Cathedral and the Bazaar. Raymond told me about the essay he's working on now. His conclusion, put simply: Software can't be commoditised. Are these guys both living in the same universe? Sure. They're just living on two different sides of Software Town.

In Cusumano's commercial-software neighbourhood, the days of the software package with a stranglehold on its market are gone - and the reason is open source. Microsoft and Oracle may swallow their commercial competitors, but they can't buy out the persistent competition of free open-source software.

The result: Software is becoming a commodity, and prices will collapse. Cusumano thinks the only way software companies can survive is through services - either selling software as a service or offering add-on services along with their software products.

It's hard to see how Cusumano could conclude that software prices will have to drop to zero - especially in an economy where clever marketing can sell a bottle of tap water for $US1.39.

Still, software is becoming a commodity - isn't it?

Across town in the open-source neighbourhood, Raymond says no. Open source isn't commoditising software, he argues - just modularising it.

Software isn't like hardware. After 200 years of industrialisation, we understand the value of commodity hardware. We want standard nuts that fi t on standard bolts, standard tyres that fit on standard wheels and standard memory that fi ts in standard motherboard sockets. Interchangeable parts introduce manufacturing economies of scale, while custom pieces don't add enough value to be worth the trouble. But software is far easier to adjust than hardware. Small tweaks can suddenly make software far more useful to some customers, but without the expensive retooling that hardware requires. The cost of differentiation is small, the value high. That makes software nearly commoditisation-proof.

Instead, Raymond said, open source was forcing software to break up into modules - standalone chunks of software that could be plugged together. Modules don't have to be identical - just act alike. So as long as the interfaces are standard and the functionality matches up, an open-source module can replace one that's proprietary.

And unlike hardware, software modules don't have to be physically in the same place to connect up. You don't need Google's software on your servers to create a Google Maps mashup. You don't need to know where Google's software is, and the mashup benefits from Google's ability to update the maps and the engine - so long as the module keeps the same interface.

As Raymond said, "Modularisation makes mashups possible".

What he didn't say is that modularization opens the door just as wide for proprietary software as for open source. Sure, an open-source module can replace a chunk of proprietary software - or, instead, modules from several different vendors can compete for the same spot, each with its own distinctive advantages for some users.

That would mean no zero pricing, but maybe a lot more value for IT shops. It would mean no more one-size-fits-all, but a much better match to what our businesses need if we really can plug together the right pieces from proprietary, open-source and software-as-a-service sources.

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