Stress Testing CTA Portfolios – Impact of Volatility Adjusting Positions

In light of recent market performance, and the corresponding effect on changes in volatility on CTA returns we thought it important to give our views on the topic. Late last year, we were asked by a prospective client to see how one of our trend following models performed over several different stress environments. We highlight one particular stress that was given- a 20% stock market drop over 3 months, with 40% of move in month 1, 35% in month 2, and the last 25% of the move in month 3. A relatively straightforward exercise, but to really understand the nuances of different CTAs relative to our approach, you must look past just the change in level, but consider the potential price paths and volatility over that stress period. The difference boils down to whether one is viewing CTAs as a standalone investment, or as a piece of a larger portfolio, and the role of volatility targeting in position sizing.
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Convex Tails

US yields have clearly shifted over the past 6 months or so. The move is justified – stronger global growth, a large fiscal package and a pickup in inflation. At this juncture, where do things stand? Interest rate futures are still pricing a hiking cycle a ways under the Fed projections. There’s about 100bps priced between here and December 2019. Not a high bar – we could reasonably have that this year, hiking once per quarter. To our eye, the measured and linear pace priced by markets is going to have to contend with economic activity that may be decidedly nonlinear. We just don’t know what happens when you slash corporate and personal taxes at very low levels of unemployment, pour on an infrastructure package at the same time, and see a pickup in global growth. Are retail sales linear when every paycheck in the country gets a big boost? Are capex plans linear when corporate taxes get markedly reduced and regulatory burdens reverse? Are wages linear at 4.1% unemployment? Is the impact of a reduced Fed balance sheet – particularly in mortgages – and an ECB that’s edging toward the door linear on term premium? How about corporate holdings of bonds under a new and drastically different tax regime? Or are these things convex? We may find out soon. It didn’t make sense that interest rate volatility was so low – it is all about the convex tails.


FOMC member interest rate projections and market pricing implied interest rate path.      SOURCE: Bloomberg

Markets Change and Shift…Issue 78

The chart below shows the 3 prices series – the US 5 year yield, the US Dollar-Japanese Yen exchange rate and the price of gold – inverted here. Each of these markets have their own fundamental drivers, but for periods of time they can share the same set of dominant factors that determine price action. A story gets built around them that sounds compelling, and correlations become self-fulfilling…for a while. In previous years, these markets have been a popular way to trade interest rate views, but the recent divergence is fascinating. It’s a good example on the importance of focusing on the areas closest to home when taking macro bets, rather than being lulled into related markets that may be correlated at the time. If those correlations change, you can be right on the view, but wrong in the implementation. That’s no fun for anyone.

The narrative around each is decently intuitive – if you thought yields would go up, positioning in the currency markets where interest rate differentials are often dominant drivers makes sense. Nowhere is this more true than in Yen, which has arguably the most extreme form of easing in yield curve control, pegging the 10 year JGB around zero. Further, Japan appears to be the furthest major economy from tightening. This made sense for a while – as you can see in the run up to the US election and the reactions afterwards, perfectly fine way to play it. The gold view was also fairly compelling – low rates would lead to inflation, which gold is a great hedge against (not that we agree, but that was the view). So higher rates, particularly real rates, would push gold down. Again, in the run up to, and coming out of the election, this was an OK way to position. Spreading risk between the three expressions was a defensible thing to do. The second chart drums it home a different way – it shows just USDJPY and the US 5 year yield, and the 30 day correlation. That’s likely too short a window, and correlations are odd things, but it gets the point across – they correlated at 0.8 during these periods.

The recent move higher though…not so much. Gold has not fallen, and the Japanese Yen has gone the opposite way. Only the rates view worked. That 0.8 correlation went to zero on a dime. New narratives are popping up to rationalize it away and sound smart ex post – but ex ante it wasn’t clear at all. No one knows if it will continue or will revert either. Markets change and stories shift – the more things change, the more they stay the same.


Source: Bloomberg


Source: Bloomberg