Doubting that we could be in a stock-market bubble? Here’s the chart

“We’re looking at the degree of euphoria. With markets really panicky last year, we have entered a very euphoric phase, and we just need to consistently gauge the levels of euphoria,” Tangen said in a recent interview with Devin Banerjee, editor at large, business and finance for LinkedIn.

“And then, of course, the real threat is inflation. If inflation really takes off, that’s going to be bad news both for our bond portfolio and for the equity portfolio. So, that’s where we have the laser focus,” added Tangen.

It’s a reminder that what some see as heady times for stocks aren’t going unnoticed.

That brings us to our call of the day from Michael O’Rourke, chief market strategist at JonesTrading, who falls into that camp with his latest note entitled “In case there are bubble doubts.”

He writes: “Since the U.S. financial markets have achieved new levels of insanity, we want to make sure we document this moment in time for posterity’s sake. Apparently, we have not learned anything from the Equity, Housing and Credit bubbles that occurred between 1999 and 2008.

“It can’t be any clearer than the fact that the S&P 500’s market capitalization is 177% of U.S. GDP,” adds O’Rourke, who provides this chart:

During the 2000 tech bubble, the S&P 500’s market capitalization peaked at 121% of nominal gross domestic product, he says.

“That should paint a stark picture as to how expensive today’s market is relative to the last generational equity bubble,” says O’Rourke, who adds that the current level is also double the average reading of the past three decades and triple the valuation where the S&P 500 bottomed during the 2008-09 financial crisis.

“Even with the greater inflationary bump to Nominal GDP, it would need to grow at 8% for a decade to return to the historic market cap to GDP average,” he says.