Direct answer: what a worked example of “FOMC” means
A “worked example” of FOMC is an educational, step-by-step scenario that shows how an FOMC decision could transmit into financial markets. Here, “worked” means you pick numbers and assumptions, then trace the chain from the decision to the variables you track (for example, expected interest rates, bond yields, and currency pricing), without pretending the result is guaranteed.
Important: the exact market path depends on many inputs and on what the market already expected. A worked example therefore explains mechanisms and uncertainty, not real-time outcomes.
Mechanism or definition: what FOMC is and what “transmission” looks like
FOMC refers to a committee inside the U.S. central bank that sets monetary policy. The committee communicates policy choices (for example, regarding short-term interest rates and guidance). Traders and investors then update expectations for future rates and the relative value of currencies.
A simplified transmission chain used in educational examples is:
- Policy decision and communication change expectations about future interest rates.
- Those expectation changes can alter bond yields (or the pricing of rate-sensitive instruments).
- Yield and expectation differences between countries can affect demand for a currency (for example, the USD) through portfolio and hedging behavior.
Evidence or example: a transparent numerical scenario with stated assumptions
Below is one illustrative worked example. It does not use live prices and it assigns all inputs explicitly.
Assumptions (state everything)
- Baseline before the announcement:
- Market expected the average U.S. policy path over the next year to be 4.00% (expected future rate).
- The “foreign” baseline (expected competing short-term rate environment) is 3.00%.
- Announcement effect on expectations:
- The FOMC communication leads the market to revise the average expected U.S. path up by +0.50 percentage points (from 4.00% to 4.50%).
- Translation to yields (simplified):
- Assume the 0.50 percentage point increase in expected policy rates maps one-for-one to the relevant effective yield differential used by the market for pricing.
- FX sensitivity (also simplified and explicitly assumed):
- Assume that a +1.00 percentage point increase in the USD yield differential produces a -1.0% move in a USD/foreign exchange rate quoted as “foreign currency per USD” (so the USD becomes relatively more valuable).
Step-by-step calculation
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Compute the yield differential change:
- Baseline differential: 4.00% − 3.00% = 1.00%
- Post-announcement differential: 4.50% − 3.00% = 1.50%
- Differential increase: 1.50% − 1.00% = +0.50 percentage points
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Convert differential change to an FX move using the assumed sensitivity:
- Sensitivity: +1.00 percentage point → −1.0% (USD appreciates)
- For +0.50 percentage points: expected move = 0.50 × (−1.0%) = −0.5% in the “foreign currency per USD” quote.
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Interpret the sign:
- A −0.5% change in “foreign currency per USD” means fewer units of foreign currency are needed to buy 1 USD (a USD strengthening in that quote convention).
What this example is trying to teach
- How to separate the decision’s impact on expectations from the later price move.
- How to make every numerical assumption visible, so you can change one assumption (for example, a smaller expectation revision) and see how the output changes.
Limitations and risks: where worked examples can fail
- Prior expectations matter more than the headline. If the market already expected a similar shift, the net expectation revision could be small, even if the decision sounds strong.
- The link from policy expectations to yields to FX is not stable. Different market segments price the same news differently (liquidity, hedging demand, and risk premia).
- Costs and execution constraints can dominate. Bid-ask spreads, financing costs, and the mechanics of hedging can affect observed moves in practice.
- Quote conventions and modeling choices change results. A different FX quoting method or a different sensitivity assumption reverses the magnitude and sometimes the direction.
Verification or next question: how to independently check what’s relevant
To verify the logic behind a worked example, you can compare, without needing real-time prices, the following:
- Did the communication change expectations (for example, did the market-implied forward-rate path move in the direction assumed)? - Was the revised expectation large or small relative to what was already priced in?