Announcement Effect

In one sentence

The announcement effect is when credible news about a future action changes prices and decisions today, even before the action happens.

Historical Context

Anticipation has long been part of economic reasoning, but the announcement effect became central in modern macroeconomics with rational expectations: if agents use available information, then news about future policy shifts current decisions and asset prices.

What drives the effect

An announcement affects the economy through expectations and intertemporal choices:

Asset pricing: yields, exchange rates, and equity prices incorporate expected future policy paths.
Intertemporal substitution: households and firms shift spending/investment across time when future prices or taxes are expected to change.
Precaution and real options: when policy uncertainty changes, firms may delay/accelerate irreversible investment.

Credibility is the key state variable

If an announcement is not believed, it produces little reaction. Credibility depends on institutions and incentives:

Commitment vs discretion: policymakers may have incentives to renege later (time inconsistency).
Track record and transparency: repeated follow-through strengthens the response to future announcements.
Implementation capacity: legal/political constraints can make promises non-credible.

    flowchart LR
	  A["Announcement<br/>(news about future policy)"] --> B{"Credible?"}
	  B -->|Yes| C["Expectations update now"]
	  C --> D["Prices adjust now<br/>(yields, FX, equities)"]
	  C --> E["Decisions adjust now<br/>(spending, hiring, investment)"]
	  B -->|No| F["Small/temporary reaction"]
	  D --> G["Implementation arrives"]
	  E --> G
	  G --> H["Additional effects if policy changes<br/>real constraints or cash flows"]

Examples (why “before implementation” is realistic)

Tax changes: an announced future VAT increase can pull consumption forward; an announced future investment tax credit can pull investment forward.
Monetary policy: a credible path for future policy rates (forward guidance) can move long-term yields immediately.
Regulation/trade: credible upcoming restrictions or tariffs can trigger inventory building, re-routing supply chains, or price changes right away.

Announcement effect vs implementation effect

It helps to separate:

Announcement (news) shock: new information about the future policy path.
Implementation shock: the day the policy actually changes constraints/cash flows.

In data, prices often react strongly on announcement dates and less on implementation dates because expectations have already moved.

Rational Expectations: Using available information to form forecasts consistent with the model’s structure.
Forward Guidance: Central bank communication about the future path of policy instruments (often policy rates).
Policy Credibility: The extent to which agents believe an announced policy will actually occur.
News Shock: Information today about a change that occurs in the future (often contrasted with surprise implementation shocks).
Time Inconsistency: A situation where a plan that is optimal today is not optimal to carry out later, undermining credibility.

Quiz

### Which of the following best describes the announcement effect? - [x] Economic behavior and prices changing after credible news of future policy, before implementation - [ ] Only the day-of implementation impact of a policy change - [ ] The process of policymakers debating potential policy shifts. - [ ] The ceasing of economic activities post-policy enactment. > **Explanation:** The key is *anticipation*: decisions and prices move when the news arrives. ### True or False: The credibility of a policymaker does not influence the announcement effect. - [ ] True - [x] False > **Explanation:** Credibility plays a crucial role in determining the extent of the announcement effect, as it affects stakeholders' confidence in the anticipated policy. ### A classic mechanism behind announcement effects in modern macro is: - [x] Rational expectations - [ ] Fixed preferences implying no reaction to information - [ ] Prices adjusting only after implementation by assumption - [ ] The idea that expectations cannot change behavior > **Explanation:** With rational expectations, news about future policy changes current choices immediately. ### Which policy tool is explicitly designed to create an announcement effect? - [x] Forward guidance - [ ] Randomized lotteries for tax refunds - [ ] Fixed-weight price indices - [ ] Barter exchange mandates > **Explanation:** Forward guidance is communication intended to shift expectations (and thus current prices/behavior). ### Does the announcement effect apply to monetary policy, fiscal policy, or both? - [ ] Only monetary policy - [ ] Only fiscal policy - [x] Both - [ ] Neither > **Explanation:** The announcement effect applies to both monetary and fiscal policies, as it concerns anticipatory reactions to any announced economic policy. ### A typical example of an announcement effect is: - [x] Long-term bond yields moving immediately after a central bank signals a future rate path - [ ] Tax revenues changing only after filing season, regardless of tax news - [ ] Prices refusing to move until a law takes effect - [ ] Output changing only after accounting statements are published > **Explanation:** Asset prices incorporate expectations about future policy, so they can move on announcement dates. ### What historical body frequently influences market actors through policy announcements? - [x] Federal Reserve - [ ] Civil Societies - [ ] Transportation Union - [ ] Performing Artist Associations > **Explanation:** The Federal Reserve's policy announcements regarding interest rates often significantly influence market behaviors. ### Can policy shocks and announcement effects be considered identical? - [ ] Yes, they are the same - [x] No, policy shocks are unexpected, while announcement effects rely on anticipated changes - [ ] Yes, but only in fiscal policies - [ ] No, because announcement effects only influence specific markets > **Explanation:** Policy shocks are unexpected, while announcement effects depend on anticipated changes and stakeholders’ reactions to announcements. ### Pick an example of an announcement effect. - [ ] Increased emissions due to industrial policy delay - [x] Immediate rise in consumer spending after the announcement of future tax hikes - [ ] Unaltered investment patterns following economic turmoil - [ ] Reduced regulatory compliance post-new policy enactment > **Explanation:** An announcement of future tax hikes leading to an immediate rise in consumer spending illustrates the announcement effect clearly. ### What methodology might investors rely on to anticipate policy changes? - [x] Rational Expectations - [ ] Supply-demand Equilibrium - [ ] Photographic Algorithms - [ ] Literary Criticism > **Explanation:** Investors and other economic agents often use Rational Expectations to predict the outcomes of policy changes and adjust their behaviors accordingly.