Direct answer
USD concentration means that a meaningful part of your total exposure is linked to the US dollar (USD) compared with other currencies. A “worked example” explains the calculation step by step with explicit assumptions, so you can reproduce the numbers using your own inputs.
Mechanism or definition
To work with USD concentration, you first need a consistent scope. Two common ways to define the same idea are:
- Value-based concentration (share of value): You compare how much of a portfolio’s total currency value is in USD.
- Input: currency amounts (for example, USD cash plus USD-denominated exposures translated into a common reference currency).
- Output: USD concentration ratio = (USD value) / (total value).
- Exposure-based concentration (share of exposure): You compare the net effect of currency movements on your position.
- Input: net long/short exposure per currency (including positions and hedges), expressed in a common unit.
- Output: USD share of total net exposure.
Because market conditions and provider mechanics vary, a worked example should treat costs, execution, and valuation timing as assumptions or exclusions.
Worked numerical example (with stated assumptions)
Below is a value-based example that you can verify independently.
Assumptions (all explicit):
- You want USD concentration at a single valuation time.
- Your “total value” is the sum of currency values at the assumed exchange rates.
- You include three currency buckets: USD, EUR, and JPY.
- You ignore fees, spreads, margin effects, funding, and any later mark-to-market changes.
- Exchange rates are assumed constants for this calculation:
- 1 EUR = 1.10 USD
- 1 JPY = 0.009 USD
Given (currency holdings/exposures in their own currencies):
- USD bucket: USD 10,000
- EUR bucket: EUR 5,000
- JPY bucket: JPY 200,000
Step 1: Convert each non-USD bucket into USD value (for valuation):
- EUR value in USD = 5,000 × 1.10 = USD 5,500
- JPY value in USD = 200,000 × 0.009 = USD 1,800
- USD value in USD = USD 10,000
Step 2: Compute total value in USD:
- Total value = 10,000 + 5,500 + 1,800 = USD 17,300
Step 3: Compute USD concentration (share of value):
- USD concentration = 10,000 / 17,300 = 0.578
- As a percentage: 57.8%
Interpretation (non-promotional): Under these assumptions, more than half of the measured currency value is tied to USD. If USD weakens or strengthens relative to EUR and JPY, the USD share and the translated total can change.
Limitations and risks (material failure modes)
-
Scope mismatch: If you measure concentration on “account base currency value” but include exposures differently (for example, notional amounts vs. current mark-to-market), your concentration figure may not represent what you think it does.
-
Timing and valuation: Concentration depends on valuation time and exchange rates used. Recalculating at a different time with different rates can produce a different ratio.
-
Incomplete coverage: If hedges exist but are omitted (or included asymmetrically), USD concentration can be over- or understated.
-
Costs and operational effects: Ignoring costs, fees, funding, and execution effects can change the realized economic impact even if the concentration ratio is mathematically correct.
-
Correlation vs. causation: A high USD share does not mean USD will move in a way that produces a particular outcome. Historical relationships between currencies do not ensure future co-movement.
Verification or next question
To independently verify a USD concentration worked example, use the same steps: (1) define the scope you include, (2) choose a valuation time, (3) convert non-USD amounts using stated exchange-rate assumptions, and (4) compute USD value divided by total value.
A useful next question is: Do you want value-based concentration (share of translated value) or exposure-based concentration (share of net currency impact)? The same holdings can lead to different conclusions depending on that choice.