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Collision course with debt supercycle?

Many people have their retirement savings invested mostly in stocks.This popular strategy could be on a collision course with the debt supercycle.
The term debt supercyclerefers to a persistent increase indebt relative togross domestic product (GDP). Until the early 1980s, debt rose modestly and pretty much in line with GDP, writes Tony Boeckh in The Great Reflation. After that, it began to rise much faster.
The chart below from Ned Davis Research shows asteep rise in total credit market debt as a percentage of GDP since the 1980s(chart sourced from Greenfaucet.com;goes back to the 1920s and showsthe creation and destruction of credit during the 1920sand 1930s).


Before the 1980s, debt outpaced GDP during the booms but was brought back more or less in line during the economic downturns. Since the 1980s, the maestros at the central banks have been quick to pump up the economy during the downturns, before the correction phase of debt wascomplete. So, each economic upturn started from a higher level of debt, resulting in a upward trend over time in the debt-to-GDP ratio.
The problem with increasing debt relative to the ability to service it, of course,is the rising risk of default and bankruptcy. The U.S. came close to that point in 2008 but averted it with another burst of stimulus. However, this is the same old response that ends up addingmore to the debt mountain before it has had much of a chance to correct.
How sustainable is the ongoing increase in debt relative to GDP?
There could be another few more years of feel-good growth in the economy and stock markets as they float upward on the latest wave of printed money. But watch the trend in the debt supercycleunderneath the surface for signs that this will prove to be a period ofartifical growth: if the debt load continues to ratchet up,the next downturn could be whenthe U.S economy really goes off the rails.