Just because I was curious as to where we currently sit with respect to economic ups and downs, I decided to take the FTSE All-Share and:
1) First adjust it for inflation, so that its history represents values on today's terms
2) Apply a trend, so that historic "as-if" numbers reflect the growth in value of its constituents' retained profits. If Astra Zeneca has a fundamental value that is 50% more now than 10 year's ago in real terms, that needs to be reflected in the figures.
The trend to use is not obvious, but because I am interested in where we are in historic value terms, I picked one that levelled out the trendline.
I went back to the beginning of 1989 mostly because there was an easy inflation index from the ONS that started in 1989.
Results below:
You can see the dot-com bubble and credit bubble clearly in this graph.
Couple of points of note:
Firstly, the long term trended average is 4319. We're currently at just under 4200 (although the last point on this curve is from 2 Dec, which was just under 4100). So from an historical point of view, we're currently about 3% below average. Or, to put it another way, we're as close to the long-term average point as makes no odds.
Secondly, the index actually spends most of its life below the long-term average, because of the way the average reflects some massive bubbles. I think from eye, you'd put the long-term bubble-free trend at more like 4100, meaning even more that we're currently at about the typical expected level.
Thirdly we've been pretty consistently at that long term level for the last 10 years. The ups and downs in that time are small compared with the periods of 1989 to 1994, 1995 to 2003 and 2003 to 2009. I find this particular surprising because my perception has been of things going all over the place since the Brexit vote. But apparently my perception is wrong.
What does this mean in terms of whether the global financial implosion is underway or not? Not much, but it does suggest that the UK market as a whole isn't too spooked right now.