I've been reading the latest quarterly update from probably my favourite analyst, guru, whatever you want to call him Jeremy Grantham of GMO.
In his latest piece, he gives a mea culpa for failing to recognise the commodities bubble before it popped. (Grantham is an expert on bubbles, which makes this an unusual occurrence.)
He also looks at why US stocks are expensive but not quite ready to pop.
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But that's not the most interesting part. There's another burgeoning bubble that's got him feeling a little more twitchy.
And it might surprise you
The end of the commodities bubble
While prices were way out of line with their historic averages usually something that signals a bubble Grantham looked at China's staggering growth rates, and the growing global population, and decided that soaring resources prices were a genuine warning that we were "facing peak everything", as he puts it.
As it turns out, it wasn't different this time. Indeed, 2011 was pretty much when commodities peaked.
Grantham's analysis of where he went wrong is worth reading in full. It's a good, worked example of how to fess up to your mistakes as an investor and work out lessons for next time. (Just Google "Grantham GMO" and get the quarterly letter from the website).
But the takeaway for now is that while commodity prices have fallen hard amid sliding Chinese demand, and are unlikely to enjoy "a quick or dramatic recovery", mining stocks given their "current very low prices will probably outperform based on historical parallels following similar major crashes".
That makes me feel more comfortable about sticking with mining stocks, despite the recent volatility Grantham has an impressive instinct for the markets, barring the resources bubble mis-step. At the start of the year, when everyone else was panicking, he reckoned that this wasn't "the big one" assets aren't quite overvalued enough and there isn't quite enough exuberance in the air as yet.
Of course, Grantham isn't saying that everything's hunky dory. He just expects everything to get a bit more bubbly before it blows. "We are unlikely, given the beliefs and practices of the US Fed, to end this cycle without a bubble in the US equity market." By his calculations, that would take the S&P 500 to at least 2,300, and he doesn't expect to see a top "before the election", at least.
But that's not the bubble that he's most concerned about.
The next bubble could be in the most dangerous asset of all again
Grantham defines a bubble as any asset that moves to two standard deviations above its long-term average (in other words, it rises a long way above its historical trend).
As of the end of last month, the ratio of the median US house price compared to the median family income was one and a half standard deviations away from its long-term average (going back to 1976).
That's pretty striking. You have to remember that US house prices (nationwide, rather than specific areas) have been pretty stable over the long run. It's nothing like the UK from that point of view US house prices have simply tracked inflation, whereas UK house prices have gone up a lot more rapidly than inflation.
But the days of easy money and the rush to find assets that might pay an income seems to have changed that somewhat. According to Grantham's data, the only other time that the price/income ratio in the US has risen above even one standard deviation was during the 2000 to 2006 bubble era.
Admittedly, prices then rose to more than three standard deviations above the mean. But as Grantham points out, that merely makes this "a classic echo bubble ie driven partly by the feeling that the substantially higher prices in 2006 somehow justify today's".
In short, "in 12 to 24 months, US house prices much more dangerous than inflated stock prices in my opinion might beat the US equity market in the race to cause the next financial crisis".
Given how much more significant property loans are on banks' balance sheets, compared to shale-oil producer debt, that's a worrying prospect. The idea that President Trump or Clinton might shortly find themselves facing the choice of whether to bail out the banks yet again, at a time when voters are still smarting from 2008, is unpleasant.
Trump might get to find out if printing even more money to buy US debt (at a discount, or otherwise) really is a feasible economic policy. And the rest of us will have to live with the consequences.
John is the executive editor of MoneyWeek and writes our daily investment email, Money Morning. John graduated from Strathclyde University with a degree in psychology in 1996 and has always been fascinated by the gap between the way the market works in theory and the way it works in practice, and by how our deep-rooted instincts work against our best interests as investors.
He started out in journalism by writing articles about the specific business challenges facing family firms. In 2003, he took a job on the finance desk of Teletext, where he spent two years covering the markets and breaking financial news. John joined MoneyWeek in 2005.
His work has been published in Families in Business, Shares magazine, Spear's Magazine, The Sunday Times, and The Spectator among others. He has also appeared as an expert commentator on BBC Radio 4's Today programme, BBC Radio Scotland, Newsnight, Daily Politics and Bloomberg. His first book, on contrarian investing, The Sceptical Investor, was released in March 2019. You can follow John on Twitter at @john_stepek.
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