Brexit and the Pound: Plenty of Downside Left

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So where are we now? It seems to me that “terrible” is not just the most likely scenario, it’s not even the worst possible scenario any more. In my view, an interim government under Labour with Jeremy Corbyn at its helm represents the worst of all possible worlds for GBP: economic dogmatism that will frighten markets coupled with a pro-Leave bias. Which is not to say that I’m any great fan of the incumbent Conservative government either, except insofar as I’m an American citizen and so grateful for any group of politicians that make our Congress seem reasonable and well-functioning by comparison.

But let’s put politics aside and look at the economics. Where is the pound nowadays? The simplest way to value the currency is relative to its past value. For this exercise, we use the real effective exchange rate (REER): the value of the currency against the country’s major trading partners, adjusted for inflation. It’s important because trade imbalances are one of the major factors moving currencies over the longer term.

On this metric, back in March, the pound was just 1.2% undervalued against a basket of currencies of the major economies. Currently, it’s about 7.1% undervalued – still not at the 10% undervalued line that has sometimes (but not always) been a barrier in the past. That means even under normal circumstances, it can fall further. And as you can see, in extraordinary circumstances, such as the Global Financial Crisis in 2008/09, that 10% line is no barrier to GBP depreciation. (Last time I used the IMF’s calculation for the GBP REER, but this time I’m using the BIS’, which is updated more frequently.)

The more theoretical way of valuing the pound would be with purchasing power parity. That’s as close a metric as we can get in forex analysis to seeing whether a currency is “fairly valued.” Looked at this way, the pound is still relatively expensive against the euro. According to the OECD’s way of calculating PPP – taking a large basket of goods and services and pricing them in different countries — the pound is 12.7% undervalued vs USD but still 8.1% overvalued vs EUR! This compares with -8.7% and +11.%, respectively, back in March. And considering that the EU is Britain’s largest trading partner (51.6% of total trade) vs 10.6% to the US and 7.6% to China, the two dominant USD trading partners, it’s clear that the pound’s value relative to EUR is the more important of the two prices. It’s got far to go before it hits up against the 20% line that has in the past provided some resistance (as that’s about the level where the currency starts to impact trade flows).