Not quite a teaser, it shows a certain ignorance on the OP's part. The growth numbers are made up of inflation (say 3% long term) and real growth, more stuff being made, more goods and services. In a closed system, a narrow index might grow. e.g. in the early 80's I saw a presenter observe that electronics was on a 14%/yr growth trend. Pull out inflation, and the growth was closer to 10%. The portion of GDP that was electronics was increasing in relative size.
But surely couldn't do that forever. At some point it would level to some percent (which I wan't about to forecast) and it would trend around that number.
