As far as the UK is concerned increasing the GDP to create new jobs is complete and utter nonsense!
You must understand that the Native British population, together with that of recent immigrants who have adapted to the British way of life, is contracting very rapidly as the old die off.
This is due to the fact that even with child benefits the majority of modern women choose to have only one or two children ie below replacement rate.
The only reason that you have a large number of unemployed amongst the indigenous and the socially adapted immigrants is that British employers prefer to take on the very much cheaper NON-UNIONIZED European immigrants.
The result is a continuous decline in the standard of liviing of the working man who has no say in what is going on ( the present 'Labour' party only represents non-manual workers ) and a maked decline in productivity as cheap manual labour takes the place of the need for investment in labour saving machines.
Both the long term standard of living of the new poor, together with productivity, will fall to third world levels - whose population increase the UK already matches.

When British Employers talk of creating new jobs they are only for imported labour whose social needs ( the reason they come) will be met by the employed tax payer.