For those of you who might not recall, the paradox of thrift posits that if we all individually cut our spending in an attempt to increase individual savings, then our collective savings will paradoxically fall because one person’s spending is another’s income – the fountain from which savings flow.

This principle is part of a whole range of macroeconomic concepts under the label of the paradox of aggregation: what holds for the individual doesn’t necessarily hold for the community of individuals. Understanding this paradox is absolutely vital to understanding macroeconomics and even more so to understanding what is presently unfolding in global financial markets.

Once the double bubbles in housing valuation and housing debt burst a little over a year ago, everybody, and in particular, every levered financial institution – banks and shadow banks alike – decided individually that it was time to delever their balance sheets. At the individual level, that made perfect sense.

At the collective level, however, it has given us the paradox of deleveraging: when we all try to do it at the same time, we actually do less of it, because we collectively create deflation in the assets from which leverage is being removed. Put differently, not all levered lenders can shed assets and the associated debt at the same time without driving down asset prices, which has the paradoxical impact of increasing leverage by driving down lenders’ net worth.