And live performance is as real as it gets.

NPR: James Taylor Gets Ready for Summer Tour

But even if it is occasionally knocked down, as it was by these bombings, the real Boston story is how it always gets up again.

CNN: Boston never surrenders

That means the real number is certainly higher and as this system gets more popular it will only increase.

BBC: London bus contactless system charging wrong cards

Some economists argue that as China gets richer it needs to allow its real exchange rate to rise, in order to reap the full gains of its economic success.

ECONOMIST: Economics focus

This implies that it is natural for China's exchange rate to be below its PPP, but as it gets richer and productivity rises, its real exchange rate should rise.

ECONOMIST: Economics focus: Burger-thy-neighbour policies | The