EM Rates Event Guide: Data, Curve Inversions, and Index Inclusion
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So you know the big picture stuff about trading EM rates. You’ve got your frameworks, your carry analysis, your real rate models. But what do you actually do when stuff happens? When CPI prints hot, when a central bank drops a surprise, when a country gets added to a bond index, when an earthquake hits?
Chapter 8 is basically the playbook for event-driven trading in EM rates. It’s shorter than other chapters but packed with practical rules you can actually use.
Inflation Surprises Have Legs
Here’s something that might surprise you: when inflation data comes in hot or cold in EM, the market reaction on day one is not the end of the story. There’s follow-through.
The authors looked at instances where two-year swap rates moved by more than 2 standard deviations on an inflation release day. After a high-side surprise, rates kept selling off for another 1.5 standard deviations over the next 20 trading days. After a low-side surprise, rates rallied about 1 standard deviation over 25 days.
So if you see a big CPI print move the market, don’t assume you missed the trade. You probably have a few weeks to ride the momentum.
But not every country works the same way. For high inflation surprises, Mexico, Hungary, Russia, and India showed the strongest follow-through. Taiwan actually moves the wrong way, so skip it for this strategy. For low inflation surprises, Chile, Hungary, Peru, and Turkey work best, while China and Poland tend to move in the wrong direction.
Why do the authors measure surprises by price action instead of Bloomberg consensus estimates? Because consensus numbers often lag what the market actually expects. And sometimes it’s the core inflation figure that surprises, not headline. The two-year swap move on release day captures the real surprise better than any survey can.
Central Bank Meetings Work Too
The same logic applies to central bank meetings. Most of the time, central banks don’t actually surprise with the rate decision itself. The surprise is in the statement, the tone, the forward guidance. That’s hard to measure against some consensus number, so again, the authors use price action as the measure. A 2+ standard deviation move in two-year swaps on meeting day tells you all you need to know about how hawkish or dovish the market found the announcement.
Dovish surprises lead to about 1.5 standard deviations of follow-through over 25 trading days. Hawkish surprises get just over 1 standard deviation over 20 days.
Country-by-country, dovish follow-through is strongest in Thailand, Israel, Colombia, Chile, Czech Republic, and South Korea. For hawkish follow-through, look to Hungary, Indonesia, Czech Republic, and Thailand. Argentina and Russia actually go the wrong way, which makes sense when you think about it. Argentina’s rates often trade more like a credit product than a rates product.
One important caveat: liquidity on event days can be thin. So this is more of a “trade in small size” kind of strategy.
Emergency Rate Hikes: Don’t Be a Hero on Day 1
Emergency rate hikes are their own beast entirely. When a central bank jacks up rates in an emergency meeting, policy makers are essentially promising that the pain is temporary. They expect to start cutting soon after. The data says they’re half right.
On average, the policy rate peaks about 50 trading days after an emergency hike. Rate cuts don’t actually start until around 75 trading days out, more than 3 months later. So that “temporary” emergency hike? It sticks around longer than anyone expects.
For traders, the rule is straightforward: don’t try to be a hero on day one. The initial reaction after an emergency hike has follow-through. Rates can keep selling off as the market waits to see if the hike actually stabilizes the currency. Keep a short-term paying bias right after the event.
The front end (two-year) sells off harder than the belly (five-year), which makes sense since emergency hikes are all about the policy rate.
Here’s where it gets interesting. About a month after the initial hike, when the policy rate is making its second leg up, that’s when the P&L for receivers bottoms out. That’s your entry point. And when you do start receiving, do it in the front end. The prior sell-off is bigger there and the negative carry is lower. The two-year receiver has a much smoother P&L path than the five-year.
It takes roughly 180 trading days before the five-year receiver starts outperforming the two-year. And it takes about 220 trading days (nearly a year) for receiver positions to get back to pre-hike levels. Emergency rate hikes are slow to unwind. That’s a useful data point not just for traders but for the central bankers who pull that lever.
Learn to Love Inverted Curves
Most investors see an inverted curve and think “steepener.” They look at a flat or inverted 2s/10s and assume it has to normalize, so they want to pay the front end and receive the back end.
The authors say: not so fast. An inverted curve might actually be telling you something good. It could mean the market is pricing in rate cuts, an upcoming recession, or the end of a tightening cycle. And if that’s the case, you want to be a receiver, not fighting the signal.
They studied all 2s/10s swap curve inversions across EM countries from 2009 to 2018 and split the results between low yielders and high yielders.
For low yielders, inversions are rare (only six in the sample), and they’re bullish. Just like in developed markets, curve inversion signals that monetary policy is too tight. The central bank usually gets the message and starts cutting, which means receiving the 10-year swap works really well.
For high yielders, the picture is messier. These inversions are concentrated in Turkey and India. Turkey’s curve is inverted about 60% of the time, compared to around 10% for other countries. For high yielders, the inversion is often caused by aggressive rate hikes, so the P&L stays negative for about 40 more trading days before it turns around. It eventually works, but you need way more patience.
The bottom line: don’t reflexively trade steepeners when a curve inverts. Instead, think about why it inverted. If it’s a low yielder pricing in cuts, receive the 10-year and ride the wave. If it’s a high yielder after an emergency hike, you’ll need to wait longer, but the payoff still comes.
Index Inclusion: Buy the News, Hold Until the Fact
When a country’s bonds get added to a major index like the WGBI (FTSE Russell) or the JPMorgan GBI-EM Global Diversified, it’s a big deal. Passive funds that track those indexes need to buy the bonds. And unlike equity index inclusion, where the trade is basically over by the announcement, in EM fixed income you can still make money after the announcement.
Why? Two reasons. First, the number of potential inclusion candidates is small, so the uncertainty is more about timing than whether inclusion happens. Second, and more importantly, buying bonds even after the announcement still makes money all the way until the actual inclusion date, which can be months later.
The data shows that bonds perform very well between the announcement and the actual inclusion. FX, on the other hand, barely moves. It’s actually slightly weaker after the announcement on average. The reason is buying pressure. The value of bonds that index trackers need to buy, divided by average daily trading volume, is much higher for bonds than for FX. Bond markets are less liquid, so the forced buying has a bigger price impact.
The optimal strategy: hold off-index positions in likely inclusion candidates before any announcement. Then add to bond positions after the announcement. Hold until the actual inclusion date. Take profits right around inclusion.
One wrinkle: for large countries, inclusion can be staggered across multiple dates. In that case, don’t take profits after the first batch. Wait until at least 50% of the total inclusion amount has been added.
At the time of writing, China was the big story. JPMorgan and Barclays Global Aggregate were already phasing China in. The WGBI, with about $2 trillion in assets tracking it, was the next potential inclusion. But given China’s enormous market size, the direct price impact on Chinese bonds was expected to be limited. The bigger effect would actually be negative for other countries in the index, as China crowds them out.
Natural Disasters: Short-Lived Receiving Opportunities
This is a topic nobody likes to think about, but it matters. When a natural disaster hits an EM country hard enough to affect the macroeconomy (damage of 1%+ of GDP), there’s a fairly clear pattern in rates.
The authors found seven such events between 2000 and 2018, including the 2011 Thailand floods (12% of GDP in damage).
Here’s what happens: two-year rates initially rally. The market expects fewer hikes or even cuts to support the economy after the shock. Central banks sometimes oblige. In the sample, two out of seven central banks eased after disasters, though one of those was arguably already in an easing cycle.
But in most cases, central banks don’t change course. The rally fades, and rates revert. The receiving trade runs out of steam about 20 days after the disaster.
The curve steepens. The front end rallies because of rate cut expectations, while the long end sells off because reconstruction is inflationary and hurts fiscal balances. The steepener peaks at about 10 basis points around 40 trading days after the event.
The practical takeaway: if a natural disaster hits, there’s a short window for receiving at the front end. But in the bigger picture, the rally is a paying opportunity. And curve steepeners are probably the cleanest trade.
Interestingly, even when a disaster causes rates to sell off because of extreme currency weakness (like the Chilean protests in late 2019), curve steepeners still work well.
Putting It All Together
Chapter 8 is basically a reference card for event trading in EM rates. Here are the key rules:
Inflation and central bank surprises have follow-through. Don’t assume the day-one move is the whole story. You have 20-25 days of momentum, at least in countries where the strategy works. Trade in small size because liquidity can be thin.
Emergency rate hikes deserve patience. Go with the flow (paying bias) right after the hike. Wait about a month for the P&L of receivers to bottom, then start receiving at the front end.
Curve inversion is not automatically a steepener signal. For low yielders, it’s a bullish signal. Receive the 10-year. For high yielders, it eventually works too, but you need much more patience.
Index inclusion is still a tradable event in EM. Buy after the announcement, hold until inclusion, take profits right around the actual date. This works way better in bonds than in FX.
Natural disasters create brief receiving opportunities. But the rallies are short-lived. Curve steepeners are the better trade.
The common thread? EM rates events take time to play out. Unlike FX, where so many moves are one-day affairs, rates events tend to offer follow-through. That’s both the opportunity and the risk. You have time to get in, but you also need the discipline to know when to get out.
Next: How to Trade EM Credit Part 1
This is a retelling of Chapter 8 of “Trading Fixed Income and FX in Emerging Markets” by Dirk Willer, Ram Bala Chandran, and Kenneth Lam. Published by Wiley, 2020. ISBN: 978-1-119-59905-0. All ideas and findings belong to the original authors. I’m just trying to make it more accessible.