Prof Steve Keen’s presentation to the UMKC Post Keynesian conference in 2012.
Paul Krugman would argue that Income = Aggregate Demand when the economy is in equilibrium.
Steve Keen shows that the economy is not in equilibrium when aggregate debt is rising or falling:
Income = Aggregate Demand + Change in Debt
He illustrates (at 13:20) how, while GDP fell from $14.5 to $14.0 trillion, the US economy went from $18.5 to $11.5 trillion because of private debt contraction.

This does not seem entirely accurate as my earlier chart of US Debt shows that Domestic (Non-Financial) Debt growth slowed but at no stage contracted during the GFC. I suspect that Steve has omitted Government Debt which acted as an important counter-weight to Private Debt contraction during the GFC.


Colin Twiggs is a former investment banker with almost 40 years of experience in financial markets. He founded PVT Capital (AFSL number 546090), which provides income and growth strategies to wholesale clients.
Colin also co-founded Incredible Charts and writes the popular Patient Investor newsletter.
Using a top-down approach, Colin identifies macro trends in the global economy and then combines fundamental and technical analysis to evaluate opportunities in sectors that stand to benefit.
Focusing on interest rates and financial market liquidity as primary drivers of the economic cycle, he warned of the 2008/2009 and 2020 bear markets well ahead of actual events.














