Tyranny of numbers

In a recent post, I discussed the rising standard of living in recent years and questioned how that could persist while the share of investment in GDP has been falling. Not only has it been falling, but to levels that seem inadequate for maintaining the capital stock—and with it, the quality of essential services like electricity. This is clearly unsustainable. If investment drops below 10 to 15 percent of GDP, the country would essentially be consuming by running down its capital—much like a household that sustains itself by selling off its furniture.