In a similar vein, comparisons of income per head can usefully take account of how much depreciation takes place each year: GDP and GNI are gross measures, while Net DP and NNI adjust for depreciation, to give a sense of how much of the economy’s production is left available for consumption.
The difference affects New Zealand and Australia comparisons quite materially: Australian GDP per capita is significantly higher than that in New Zealand, no matter what adjustments one does, but because the Australian resources sector is very capital intensive, much of the income is needed simply to cover the depreciation on the capital stock.