Our easy access to plastic is about to dry up – and with it our ability to fake living the good life.

By Geoff Colvin, senior editor at large

Last Updated: August 20, 2008

(Fortune Magazine) — We made it through the bursting of the Internet bubble and now the bursting of the real estate bubble. Next we may be approaching the end of the most worrisome bubble of all: the standard-of-living bubble.

That conclusion comes from the latest data on credit card debt. It’s growing fast, but the problem is bigger than that – and to understand what it means, we have to take a few steps back.

For the past several years, the average inflation-adjusted total pay of American workers hasn’t been increasing. That means we haven’t been building a foundation for increases in our living standard. You might be tempted to say that by definition our living standard couldn’t have increased, but that’s not quite right. Even with stagnant real incomes, we can always live a little better every year through borrowing and pretending that our living standard is still rising, just as it was for decades.

So the Great Bull Market made us feel rich, and we felt justified in saving less and borrowing – and spending – more.

After stocks collapsed, home prices took off, making us feel rich all over again. So we continued saving less and spending more, creating the illusion that our living standard was still rising. In 2005 our personal savings rate went negative, but even that didn’t slow us down, because our homes were still appreciating – and rising home values meant that household net worths weren’t declining. (Don’t be fooled by that saving-rate spike in this year’s second quarter; it was probably a one-time event resulting from the federal stimulus payments.)

Of course, we don’t hear those assurances anymore. Stocks are back where they were eight years ago, and home prices are where they were five years ago. But personal debt is much higher than ever before, and average pay is still going nowhere in real terms. So now how do we live as if our living standard is still rising?

End of easy money

That’s where the credit card reports come in. Last year, just as the subprime crisis happened, credit card debt took off. The home-equity ATM had been shut down, so people turned to the last source of easy money they had left, the most expensive debt on the menu, credit card borrowing.

Since credit card debt has been growing much faster than the economy – more than 8% in last year’s third and fourth quarters and over 7% in May (the most recent month reported)- people are apparently using it as a substitute for income. Thus, for the past year or so we have still maintained the standard-of-living illusion.

But a big crunch is coming – and here’s why…

JimG

has been writing computer programs since 1970, and is still debugging them. The first modem he used was as big as a washing machine but not nearly as useful.