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There's a really comprehensive (and long) article in The New York Times about memories on the Internet. It highlights one of the things that's been stewing in the back of my mind for a few months now, ever since I decided to leave my job. The basic idea is that pretty much everything should have an end, and that people should know it.
The NYT article above talks about a lot of things relating to privacy on the Internet, and discusses the possibility of implementing expiration dates on data, after which the data would no longer be accessible (page 5 if you want to skip right to it). Given the way computers work now, and how easy it is to make digital copies, implementing this is practically impossible without a ground-up redesign of a lot of things. But it's still a good idea.
The specific expiration date that was relevant to me a couple of months ago was my last day at work. I wondered what it would be like if every employee, instead of having an open-ended full-time contract, had a limited-term contract which had to be renewed when it expired. This would allow companies to let go of employees who were under-performing, which increases the incentive for employees to perform at their best. Of course, it works both ways - the employer too must do their best to retain the good employees, since they would be free to go anywhere else once the contract expired. This would increase competition on both ends, presumably resulting in better conditions for everybody.
Note that all human societies that I'm aware of already use expiration dates in some important domains. As an example, consider how most elected officials are elected for a fixed term; without this sort of expiration date democracies wouldn't work at all. Human life itself has an expiration date (although it's not specifically known, and is more variable), without which evolution (both physical and societal) would not be possible. In both cases the presence of the expiry date allows for change and improvement at a much faster pace than would be otherwise possible.
With the concept of expiration, we also have to consider the concept of renewal. A lot of human-instituted expiration dates allow for renewal, where the expiration date is pushed back. For example, it's hard to imagine a fixed-term employment contract that doesn't allow for renewal. Why is it, then, that the president of the USA isn't allowed to serve for more than two terms?
I think that the more important the contract, the more important it is that the expiration of the contract NOT be allowed to renew. Death, after all, is not a renewable expiration date. In a sense, allowing it to renew undermines the expiration date in the first place. If you know that the expiration date can be pushed back, then you're going to behave accordingly; without that "the end is near" feeling, there's no impetus to complete whatever task needs completion, and no impetus to build a legacy worth remembering. Allowing the possibility of renewal also means that there has to be an entity that decides whether or not the renewal is justified. That introduces a whole raft of problems with criteria for renewal and subjective evaluation; enough problems, in fact, that entire religions have been created on this topic. Literally.
Another area in which I think expiration dates are becoming increasingly important are laws. Things like the USA PATRIOT Act came with built-in expiration dates on some of the sections, so that powers granted to the FBI and other agencies would only threaten civil liberties until the terrorist threat was taken care of. Unfortunately, some of those expiration dates were renewed and others ignored, resulting in the occasional abuse of power. And of course, everybody's heard of some of the really out-dated laws that are technically still valid. Not all of these problems would be solved by expiration dates more widely, but some certainly would.
There's a lot of other domains out there that could benefit from having expiration dates on contracts (using the term loosely), both of the renewable and the non-renewable kind. They just need to be selected and used judiciously, which won't happen unless people start thinking of them as a tool.
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