To be sure, even with the increased flexibility implied in a paradigm of expanding globalization and innovation, the combination of exceptionally low saving rates and historically high ratios of household debt to income can be a concern if incomes unexpectedly fall. Indeed, virtually any debt burden doubtless will become oppressive if incomes fall significantly.
But rising debt-to-income ratios can be somewhat misleading as an indicator of stress. Indeed the ratio of household debt to income has been rising sporadically for more than a half-century, a trend that partly reflects the increased capacity of ever-wealthier households to service debt. Moreover, a significant part of the recent rise in the debt-to-income ratio reflects the remarkable gain in homeownership.