The cost of policy noise
Every unexplained reversal has a price. It is not paid at the moment of the announcement but months later, in the risk premium — and it is paid by everyone.
Announcements are cheap. Reversals are not. Between the two lies the quantity economists dryly call policy uncertainty and everyone else experiences as noise.
What noise actually costs
An investment decision has three inputs: expected return, financing cost, and the confidence interval around both. Policy noise does not usually change the first two directly. It widens the third — and a wider interval is enough to postpone the decision entirely.
This is why noise shows up in the data with a lag and in a disguised form:
- Investment is deferred rather than cancelled, so it never appears as a headline collapse.
- Maturities shorten, which looks prudent rather than defensive.
- Pricing power is exercised earlier, which is read as greed rather than hedging.
Three habits that produce it
- Announcing before deciding. A measure floated to test reaction, then withdrawn, teaches everyone to wait rather than act.
- Changing the definition instead of the target. Once a metric is redefined mid-course, every future metric is discounted.
- Overlapping authorities. When two bodies can plausibly claim the same decision, market participants price the more restrictive one.
Predictability is not the opposite of flexibility. A rule that says in advance how it will bend is more flexible in practice than one that bends without warning.
What reduces it
Noise is reduced not by saying more, but by saying less and keeping to it. Publishing the reasoning alongside the decision, keeping the calendar fixed, and explaining a reversal in the same detail as the original announcement — these are inexpensive habits with compounding returns.
The countries that manage this do not enjoy better luck. They simply spend less of their income on the cost of being unpredictable.
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