Direct answer
The spread associated with a Currency Strength Meter reading is mostly affected by how prices are quoted and executed. In practice, the meter is a display tool that depends on underlying exchange-rate inputs; those inputs come with bid/ask prices. The spread (ask minus bid) can widen or narrow due to liquidity, volatility, execution venue, and provider-specific pricing/execution policies.
Mechanism and definition
A spread is the difference between the bid (the price at which you can sell) and the ask (the price at which you can buy). If a Currency Strength Meter uses exchange-rate quotes, the meter’s computed values will be based on some mix of bid/ask inputs (or a derived “mid” value). Even if the meter visually focuses on “strength,” the underlying quotes still have a spread.
A useful way to think about the meter is:
- It aggregates many currency-related rates into a single comparative measure.
- Each component rate comes from a market quote that may have a bid/ask spread.
- Therefore, the meter’s apparent behavior can shift when the spreads of its underlying inputs change.
Important assumptions for this explanation:
- You are not receiving real-time tick data here; you are explaining the general mechanics.
- The same underlying currency pair can show different spreads depending on time, liquidity, order size, and execution conditions.
Variable factors that widen or narrow spreads
1) Liquidity and market depth
Liquidity is how easily market participants trade at quoted prices. When liquidity is high, it is usually easier to buy at the current ask and sell at the current bid, so the spread tends to be smaller. When liquidity is low (for example, fewer participants or less depth at the top of the book), spreads tend to widen.
In a Currency Strength Meter context, this matters because:
- The meter depends on multiple currency legs or rates.
- If one or more underlying rates becomes illiquid, their bid/ask spreads can widen.
- The combined “strength” display can become more volatile mainly due to widening spreads rather than a true change in economic fundamentals.
2) Volatility and speed of price changes
Volatility describes how quickly and how much prices move. With higher volatility, dealers and liquidity providers may widen spreads to manage the risk of being hit by fast price movement between quote updates.
A key failure mode here:
- If you interpret meter movements as purely “strength changes,” you can misattribute changes caused by spread widening (cost and pricing behavior) to changes in relative currency value.
3) Execution venue and pricing model
The realized spread you experience is not only about the market’s displayed spread; it also depends on execution venue and how orders are matched or filled. Common ways realized spreads differ:
- Order type and timing: A market order can consume available liquidity quickly, effectively paying a worse price if the top quotes disappear.
- Depth consumption: For larger trades, you may trade beyond the top-of-book, increasing the effective spread.
- Quote sourcing: Some systems show vendor quotes; others may reflect different liquidity aggregation methods.
So even with identical “strength” logic, the spread behavior can differ because the underlying quote or fill is different.
4) Provider policy and operational constraints
Providers (or platforms) may apply policies that affect spreads, such as:
- How they publish or convert quotes (bid/ask versus mid-derived calculations).
- How they handle abnormal conditions (fast markets, low liquidity, partial fills).
- Risk controls that can change execution behavior.
This leads to another limitation:
- Two users can see different spreads and thus different meter smoothness, even when they think they are using the same underlying concept.
Limitations, risks, and independent verification
Material limitations / failure modes
- Spread-driven “signal” confusion: Large meter swings can come from widening bid/ask spreads rather than from changes in the mid price or relative valuation.
- Aggregation hides the source: Because a meter combines many currencies/rates, it can be hard to identify which input spread is driving the effect.
- Realized vs quoted spread: The displayed spread may differ from what your order actually pays, especially with market orders or during fast changes.