The storyline would have to do some major backflips to keep moving forward, and these prequel games show that even moving backward is hard too.

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Mumbai is too backward, and other cities are even worse.

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The technique itself is 90 years old, and even the Swedish Royal Academy of Sciences is not that backward-looking.

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Mr Chidambaram reckons that up to 40% of the cash is probably lost this way, though the figure could be as high as 75% in the most backward states, and some analysts put it even higher.

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Other firms claim that their backward-looking and forward-looking measures are even more closely correlated.

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As Representative Edward Markey noted, auto fuel economy peaked at 26.5 miles per gallon in 1986, and "we've been going backward every since" - even though we have the technology to change that right now.

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