Sunday, 15 March 2020

Lenses

A chart of the monthly FTSE 100 price looks something like this:

Monthly FTSE 100 Price
Click to enlarge, Monthly FTSE 100 Price

This is the chart that you’ll see on all the mainstream media channels and it shows that the FTSE 100 still has about 32% to fall if it’s going to match the worst of the global financial crisis (GFC).  This sounds like a long way until one thinks about a big failing with this type of chart.  It’s unit of measurement…  The FTSE 100 is priced in £’s and they’re constantly being devalued via inflation.  So, let’s take out a different lens and try and look at the chart in real, inflation adjusted, terms.

Firstly, let’s correct for the consumer price index (CPI):

Real (CPI) Monthly FTSE 100 Price
Click to enlarge, Real (CPI) Monthly FTSE 100 Price

That shows that instead of falls of 32% being needed it’s actually closer to falls of 16% for parity with the worst of the GFC.