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You can regulate or deregulate financial markets all you want, but none of that is going to change the fast-approaching Mega-Depression. The planets overall economy (not just its financial economy, but it's resource and environmental economy as well) is like a full bus powered by a worn-out lawnmower engine. Too many people being supported by limited and dwindling resources such as fossil fuels, fresh water, and commercially mineable minerals, added to an atmosphere damaged by greenhouse gas emissions and soot,is a sure formula for economic disaster.
Economists have traditionally made assumptions about the Earth having an unlimited supply of resources and an unlimited capacity for absorbing waste. Most of the letters here do not factor in the planet-wide stresses that threaten to knock the underpinnings out of any conventional economic management scheme. Until the connection of economic well-being to ecological well-being is made and drastic action is taken, I see little hope of averting the Mother Of All Depressions.