Currency Management: An Introduction

Welcome to Currency Management!

Welcome to one of the most practical and high-impact chapters in the CFA Level III curriculum. Whether you are managing a global bond fund or a diverse equity portfolio, currency risk is the "hidden passenger" that travels with every international investment. In this chapter, we will learn how to decide whether to embrace that passenger, ignore them, or kick them out of the car entirely!

Don't worry if foreign exchange (FX) has felt like a maze of "base" and "price" currencies in the past. We are going to break it down step-by-step, focusing on the strategic decisions a portfolio manager must make.

1. The Basics: Why Does Currency Management Matter?

When you invest in a foreign asset (like a Japanese stock), your total return in your home currency—called the Domestic Currency Return (\(R_{DC}\))—depends on two things:
1. The return of the asset itself in its local currency (\(R_{FC}\)).
2. The change in the value of the foreign currency relative to your own (\(R_{FX}\)).

The formula to remember is:
\( R_{DC} = (1 + R_{FC})(1 + R_{FX}) - 1 \)

Real-World Analogy: Imagine you buy a vintage camera in London for £100 when £1 = \$1.20. You sell it a year later for the same £100 (0% asset return). However, if the Pound has strengthened to £1 = \$1.30, you now have \$130. You made money just because of the currency! Currency management is about deciding how much of that "currency movement" you want to keep.

Key Takeaway:

Currency risk can either magnify your gains or wipe them out. For fixed-income portfolios, currency volatility often represents a huge portion of total risk. For equity portfolios, it is usually a smaller (but still significant) piece of the pie.

2. To Hedge or Not to Hedge? (Strategic Choices)

A portfolio manager has several "philosophies" they can choose from when dealing with currency:

• Passive Hedging: The goal is to eliminate currency risk. You use a benchmark (usually 100% hedged) and try to match it. This is "set it and forget it."
• Active Management: You intentionally take currency positions because you believe you can predict which way the exchange rate will move to earn Alpha.
• Discretionary Hedging: You usually hedge, but you allow yourself some "wiggle room" to leave positions unhedged if you have a strong opinion.
• Currency Overlay: This is when currency management is treated as a totally separate department or sub-advisor. They manage the FX risk for the whole firm independently of the bond or stock pickers.

Did you know? Many managers choose not to hedge because, over very long periods (decades), currency movements tend to mean-revert (return to average). However, most clients can't wait decades for a recovery, which is why hedging is so common!

3. Factors Influencing the Hedging Decision

How do we decide if we should hedge a specific currency? It’s not just a coin flip! Here are the curriculum's key drivers:

A. Risk Aversion

If the investor is very risk-averse (hates losing money), they will prefer more hedging. This is common for pension funds or retirees.

B. Time Horizon

In the short run, currencies are volatile. In the long run, they are thought to be more stable. Therefore, shorter time horizons usually require more hedging.

C. Correlation between Asset and Currency

This is a "trick" concept that often appears on exams!
- If the asset and the currency move in opposite directions (negative correlation), they naturally offset each other. This is a "natural hedge," so you need less formal hedging.
- If they move in the same direction (positive correlation), the risk is doubled. You need more hedging.

D. Cost of Hedging

Hedging isn't free. You have transaction costs (bid-ask spreads) and opportunity costs (if the currency moves in your favor and you hedged it away, you missed out).

Quick Review:

Hedge MORE if: Investor is risk-averse, time horizon is short, or asset and currency are positively correlated.
Hedge LESS if: Hedging costs are high, or asset and currency are negatively correlated.

4. Theoretical Drivers of Exchange Rates

To manage currency actively, you need to understand what makes them move. The CFA curriculum focuses on three main theories:

1. Purchasing Power Parity (PPP): This says that in the long run, exchange rates should adjust so that a "basket of goods" costs the same everywhere. If inflation is high in the UK, the Pound should depreciate.

2. International Fisher Effect: This suggests that countries with higher nominal interest rates have higher expected inflation, which leads to currency depreciation.
Note: This is a long-term theory and often fails in the short term!

3. Uncovered Interest Rate Parity (UCIRP): This claims that the difference in interest rates between two countries should be equal to the expected change in exchange rates. If the USD pays 5% and the Yen pays 1%, the USD should depreciate by 4% so that investors are indifferent.
Common Mistake: In the real world, UCIRP rarely holds in the short term, which leads to the famous Carry Trade.

5. The Carry Trade: A Favorite Exam Topic

The Carry Trade is when you borrow money in a "low-yield" currency (like the Yen) and invest it in a "high-yield" currency (like the Australian Dollar).
You are essentially betting that UCIRP will fail.

How it works:
1. Borrow in Currency A (Low interest).
2. Convert to Currency B (High interest).
3. Invest in Currency B.
4. At the end, convert back and pay off the loan.

The Risk: "Crash risk." The carry trade is like "picking up pennies in front of a steamroller." It works great until the high-yield currency suddenly devalues, wiping out all the interest gains instantly. Carry trade returns are often negatively skewed (meaning they have small frequent gains and rare, massive losses).

Key Takeaway:

The carry trade thrives when market volatility is low. When investors get scared (high volatility), they "unwind" the trade, causing the high-yield currency to crash.

6. Strategic Portfolio Management: Cross-Hedges and Macro Hedges

Sometimes, it is too expensive or impossible to hedge a specific currency directly. We then use alternatives:

Cross-Hedge: Hedging a currency position using a different currency that is highly correlated with the one you own.
Example: You own a Swedish Krona (SEK) asset but hedge it using the Euro (EUR) because the EUR market is more liquid and the two currencies move together.

Macro Hedge: Instead of hedging every single stock, the manager looks at the entire portfolio's exposure to a certain risk factor (like "Commodity Currencies") and places one big trade to protect everything at once.

7. Summary and Tips for Success

• Don't ignore the math: Practice the \(R_{DC}\) formula until it's second nature.
• Understand the "Why": Why would a manager choose a 50% hedge ratio instead of 100%? (Usually to balance risk reduction vs. cost).
• Watch for Biases: Many investors suffer from Home Bias—the tendency to keep too much money in their domestic currency, even when international diversification would help.

Don't worry if the various "Parities" feel confusing at first. Just remember: In the CFA world, we use these theories as "anchors" to help us decide if a currency is overvalued or undervalued relative to its fundamentals!