Direct answer
A “worked example” for USD/JPY brokers is a numerical scenario that shows how a broker’s typical costs (spread and any commission) and execution effects (slippage) can influence the profit or loss from the same underlying USD/JPY price change. Because broker conditions vary and markets move unpredictably, the example should state every assumption clearly and treat the result as scenario math, not a forecast.
Mechanism or definition
USD/JPY is quoted as how many Japanese yen (JPY) for 1 US dollar (USD). In a broker environment, the economic outcome of a trade is mainly driven by:
- Price movement: the difference between the trade’s entry and exit prices in USD/JPY.
- Spread: brokers commonly quote separate bid and ask prices; buying uses the ask and selling uses the bid, creating an immediate cost.
- Commission and fees: some brokers add per-trade commissions; others may reflect costs primarily through spread.
- Execution quality: orders may fill at slightly different prices than expected due to liquidity and latency, creating slippage.
- Position sizing assumptions: calculations depend on how many units of the base currency are traded (and on the contract specification used).
A crucial idea is break-even: the price movement required to offset spread and fees, given the assumed execution.
Worked example (with explicit assumptions)
Scenario: A trader conceptually wants to evaluate “USD/JPY broker” effects without using live prices. Assume:
- Trade direction: long USD/JPY (buy USD, sell JPY).
- Notional/units: 100,000 USD of exposure (a common “one lot” style amount in many broker schemas; the exact contract definition must match the broker).
- Quoted mid price at entry: 150.0000 JPY per USD.
- Spread at entry: 0.0200 JPY. Therefore:
- entry ask = 150.0100
- entry bid would be 149.9900 (not used for a buy entry, but it explains the spread cost)
- Commission: 0 JPY for simplicity (some brokers have commissions; if they do, add them as fixed cost).
- Exit mid price: 150.0500.
- Exit execution: assume the trader is filled at the exit bid for a long position, which is 0.0200 JPY lower than the mid when spread remains 0.0200.
- exit bid = 150.0400
- No slippage beyond spread: fills occur exactly at those bid/ask levels.
Now compute the USD/JPY price change relevant to the position:
- Entry price (ask) = 150.0100
- Exit price (bid) = 150.0400
- Net price movement = 150.0400 − 150.0100 = 0.0300 JPY per USD
Convert to a P/L-like figure in JPY (based on the assumed 100,000 USD exposure):
- JPY gain = 100,000 USD × 0.0300 JPY/USD = 3,000 JPY
Same price movement, worse execution (slippage example)
Keep all assumptions the same except execution quality:
- At entry, assume slippage worsens the fill by 0.0050 JPY against the trader: entry ask becomes 150.0150.
- At exit, assume slippage also worsens the fill by 0.0050 JPY against the trader: exit bid becomes 150.0350.
Then:
- Net price movement = 150.0350 − 150.0150 = 0.0200 JPY per USD
- JPY gain = 100,000 × 0.0200 = 2,000 JPY
Interpretation: even with the same “mid price” improvement from 150.0000 to 150.0500, execution differences and spread handling can materially change the outcome.
Limitations and risks (what can fail in the example)
- Assumption mismatch: contract size and how P/L is converted can differ by broker. The example uses a simplified “USD notional × JPY movement” model.
- Spread variability: spread often changes during news, at the start/end of sessions, or when liquidity is thin. A fixed 0.0200 JPY spread is a simplification.
- Slippage uncertainty: slippage can be larger than expected and directionally unfavorable, especially during fast markets.
- Fees ignored or double-counted: if a broker charges commissions or financing/overnight costs, you must incorporate them consistently into the break-even calculation.
- Historical relationships do not ensure outcomes: even if brokers’ typical spreads appear stable in the past, future conditions can differ.