Though you wouldn’t think it to see the way the market reacts, inflation is bad for currencies. If your prices rise relative to other countries your currency needs to fall to . equalise prices. Countries with high inflation have typically seen sharply declining currencies to offset the effect on relative prices. But typically, when inflation comes out higher than expected in the major economies, the market responds by pushing the currency in question up, not down. Why? Because the assumption is that the relevant central bank will raise rates to combat inflation pressures or not cut rates as much as it would otherwise, more than offsetting the move in inflation. Or at least that yields will rise to more than compensate for the rise in inflation. But the world doesn’t actually work like that, and hasn’t worked like that since at least the financial crisis and probably before.
The charts below show US and German CPI inflation plotted against real 3 month T-bill rates and real 10 year yields. If the FX market was right and central banks and markets responded to higher (lower) inflation with higher (lower) real yields, you would expect there to be a positive correlation between inflation and real yields. Broadly speaking that was the case in the 80s, though only broadly speaking. Not much happened in the 90s, with inflation and real yields broadly steady on a trend basis. But from around 2004 there has been a very clear negative correlation between inflation and real yields. Inflation has mostly fallen, and when it has, real yields have risen. Why? Because either central banks have had more pressing concerns than current inflation, as was the case immediately after the 2008 crash, or because they reached a lower bound in yields preventing them from reducing real yields any further, so effectively nominal rates were fixed. This means that a decline in inflation has, ex post, actually made a currency more not less attractive for the last 10 years.
Source: FRED, FX Economics
Now, it may be that there will come a point where central banks and markets start to react to higher inflation by pushing real rates up. In the US, this may not be too far away, but it still looks a long way off in the Eurozone and Japan, where higher inflation would be seen as a good thing and won’t be offset by higher nominal short term rates, never mind higher real rates. Although the markets may allow longer term yields to rise somewhat, it is still doubtful that rises in inflation will be offset by higher real yields (i.e nominal yields rising more than inflation) in the near term. Even if they are, the point about higher nominal yields is that they compensate the FX market for the decline in the currency that will happen because of inflation. A rise in inflation accompanied by an equal rise in yields should in theory have no immediate effect on a currency. The currency should be expected to be a little weaker going forward because of higher inflation, but the investor is exactly compensated for the lower expected value with higher yields.
So why do FX markets react as they do? Because it is clear that they see higher inflation as a positive thing for currencies because of the perceived implication for yields and central bank policy. It may simply be money illusion. That is, higher inflation, will at the margin, mean higher nominal rates, but at this stage and for the last 10 years this has not meant higher real rates, as is clear from the charts. Or is it just that the market is stuck in some sort of 80s mindset imposed on it by people who have simply observed the past – i.e. that higher than expected inflation typically meant currencies rallied, so all the models (carbon and silicon) are programmed that way for evermore?
Whatever the reason, it’s time the market woke up and smelled the coffee. Central banks are not straining at the leash to raise real rates to head off rising inflation. In fact, the (broadly) effective zero lower bound in nominal rates has meant many are hoping to get inflation higher precisely because it’s the only way they can get real rates lower.
So higher inflation should be seen for what it is. It is an effective real currency appreciation. Prices are higher relative to the rest of the world just as they would be if the currency had fallen. The proper FX market response to that is to reduce the value of the currency to equalise domestic and foreign prices accordingly, not to push the currency up in the expectation of a central bank response that isn’t going to come, and if it did wouldn’t fully offset the inflation move anyway.