Sunday, September 09, 2012

Did the Indian GDP just jump up by a basis point?

Google made two important announcements:
  • The database underlying google maps is now of the quality required to support turn-by-turn navigation. Every smart phone or tablet that can use google maps just became a GPS device that is capable of giving you turn-by-turn navigation including giving you instructions in audio.
  • In six cities, they now have realtime traffic data available as an overlay on google maps. You can look at the map and it will show you what segments of what roads are congested.
This will, I assume, enable cool things within applications like Google Now to work: it knows your calendar, it analyses traffic conditions, and tells you at the right time "Now it's time for you to leave". Similarly, we can now use Google Places ("search for a coffee shop close to where I am right now"). It shows you the list of what's available, you touch one of them, and it's now ready to give you turn-by-turn directions to go there.

Industry sources say there are roughly 26 million smart phones out there that are able to use google maps. In other words, we have just had 26 million satnav devices added to the Indian capital stock. And, we've added realtime traffic data for the subset of these that are in 6 cities. Millions of people have just had a jump in productivity.

An interesting Fermi problem : Will this add one basis point to GDP? At first, I thought this was hard because it'd require making assumptions about how much time each satnav saves for the person, that person's output per minute, and so on. But a reverse calculation is illuminating: 1 basis point of GDP is Rs.1000 crore or Rs.10 billion. Divide by 26 million smart phones and you get : a flow of increased output of Rs.384 per satnav per year. In other words, if each satnav device adds Rs.384 of output to the owner's life per year, then Google's turn-by-turn navigation added 1 bps to GDP. And I'm not even counting the impact of realtime traffic data. This number (Rs.384 per satnav per year on average) seems plausible to me.

You may like to see this material on map databases in India.


  1. I used this today in Bangalore and the accuracy is just amazing. It picked a streetside pharmacy name while giving direction, very cool. Incidently, the pharmacy is not even two year old so the data is very recent. The traffic data is also fairly accurate almost to the minute. I checked at 11 pm and the map showed the traffic was smooth near my house and at around 11.30pm it showed red lines and true to form there was famous banglore ritual of nakabandi for drunk driving checking was set up near my house and as a result the traffic was piling up for almost a km as all bars in the vicinity closed at 11.30 pm.


Please note: Comments are moderated. Only civilised conversation is permitted on this blog. Criticising me is perfectly okay; uncivilised language is not. I delete any comment which is spam, has personal attacks against anyone, or uses foul language. I delete any comment which does not contribute to the intellectual discussion about the blog article in question.

Please note: LaTeX mathematics works. This means that if you want to say $10 you have to say \$10.