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Rational Expectation

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Is the assumption of rational expectations sufficient to ensure policy neutrality?

Expectations play a vital role in determining the behaviour of the economy. How agents respond to a policy decision is critical to understanding the size and direction of the economy. For example agents make decisions to buy/sell stocks depending on their expectations of future profits or future interest rates. Therefore policy makers should take into account the expectations of people who make choices that affect future outcomes. In addition to agents’ expectations of future, we need to consider what information is available to the agent and based on what kind of knowledge does the agent make a decision at the first period (t). Previously economists modelled expectations on recent past information available to agents which the agents than used to adapt to the current situation; this form of adaptive expectations behaviour means that agents learn from past experience to expect future event, which means that adaptive expectations will be useful when future events are the same as past. Let’s look at a simple example of adaptive expectations (AE) first to lay the foundation for the other important and more relevant assumption of rational expectations (RE).

If we had an inflation rate today of 3%, agents who use AE will forecast that next period’s inflation rate as 3%. So, with this basic example of AE we would have π ’ π t − 1 Where inflation expected is equal to the lagged inflation rate. So if next period’s expected π is 3% based on last period forecast of 3% and actual inflation becomes 5%, there is a 2% unanticipated rise in inflation so the agents, based on this assumption, make systematic prediction errors of future inflation rate because they based it on the previous rate of inflation, the same systematic error would occur if inflation fell by 2%, the agents would

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