A streak — achieving something on a schedule without missing a slot —  has a remarkable pull over us when it comes to helping us get things done. As Seth Godin points out, streaks turn an activity into a game. And while we may have started out with the intention simply of completing the activity, our continued motivation can transfer to simply be the motivation of keeping the streak going.

If you’re into streaks or want to give them a try to achieve something yourself, you might like the Streaks app (which is how I knew I’d done 2 years without missing), Austin Kleon’s 30-day challenge, or the simple power of one-a-day.

Streaks can also have a dark side: if you break the chain you can think it’s not worth getting started again. For that reason, I like James Clear’s advice to never miss twice.

The power of streaks

Marchetti's constant is the idea that people across history budget, on average, about an hour a day for travelling. Originally observed by Yacov Zahavi, it came from the observation that even as our means of transport sped up, instead of travelling less each day, we would just travel further. As in the sketch, this leads to a conclusion that the size of our cities increases partly according to how efficiently we can travel in and out—they generally increase to a size that maintains about an hour round-trip journey.

Cesare Marchetti observed that Greek villages and ancient walking cities, for example, as marked by ancient city walls, tend to share a radius of about 2.5km. Walking at a typical 5km/hr makes a one-hour round-trip journey. He also pointed out that: “Even people in prison for a life sentence, having nothing to do and nowhere to go, walk around for one hour a day, in the open.”

Unfortunately, if you live in London, the average round-trip seems to be an exception of 1h30.

This is also known as the constant travel time budget hypothesis.

Also see isochrones. It might be interesting to look at these according to transport method…

Image adapted from: Marchetti, C., 1994: Anthropological Invariants in Travel Behavior, Technological Forecasting and Social Change , 47 :75–88, Internal Publication, International Institute for Applied Systems Analysis.

Marchetti’s constant

Back in 1865, a chap called William Stanley Jevons noted that while there had been a number of improvements in coal efficiency in steam engines and the like, instead of reducing consumption the effect was to increase consumption instead — Jevon's paradox.

While it’s not a surefire outcome, there are plenty of parallels like more efficient batteries leading to more overall battery use, washing machines leading to doing more washes rather than less time spent washing, or the ability to recycle some plastics leading to more overall plastic consumption.

This is sometimes known as the rebound effect.

Also see the fifth fuel: energy efficiency, and save some landfill.

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Jevon’s Paradox