A basic problem with the often quoted personal saving rate is that it mixes together current workers with retirees who should be expected to spend much more than they earn. One academic economist has calculated that excluding retirees from the figures would add about 4 percentage points to the saving rate. Moreover, this error should grow over time as the US ages and healthcare costs (a major purchase for retirees) continue to grow.
Another problem with the saving rate is that when consumers buy durables - think cars, furniture and appliances - the spending is counted right away even though payments will be made over time. Amortizing these purchases would push up the saving rate another 2 percentage points.
From economists Brian Wesbury and Robert Stein at First Trust Portfolios.
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