If you have not yet read Part I: "Endless Growth" Is the Plan & There's No Plan B available free to all readers, please click here to read it first.

A Big Hole

When the Treasury Department estimates that the U.S. has a ~$65 trillion NPV (Net Present Value) shortfall in its main accounts, it's saying that using its assumptions, the U.S. government would need to have $65 trillion – today – in an account, earning a stated rate of interest, in order to be solvent.

Since the U.S. government don't have that have that kind of scratch, it's insolvent. 

But the real picture is likely worse. The Fed calculates the NPV shortfall to be closer to $100 trillion. And if you believe Lawrence Kotlikoff's math, the figure is closer to $200 trillion. Either way – $65 trillion, $100 trillion, or $200 trillion – the sum cannot be paid.

So it won't be.

And the real trouble is that all of these numbers make the same implicit assumption: The future will more or less resemble the past. That is, some form of future growth – exponential future growth – of the economy is at the heart of every single calculation.

But we might question that, because somewhere between here and there, economic growth will have to come to an end. Or at least a pronounced deceleration. Why? Quite simply, because the earth is finite.

Now, we might comfort ourselves with the belief that our future date with hard limits is lifetimes away. But when we do, we shortchange ourselves (if we're wrong) and our progeny (if we're right). After all, the time to make an adjustment is when the resources and energy exist to make that change.

And that's now. Or, really, decades ago…