The omission of the announcement of fiscal policy from the estimated VAR has consequences
for the estimated effects of both monetary and fiscal policy. Because fiscal policy
is announced in advance, its effects show up almost immediately in interest rates and
other financial variables, and only later in other variables; consequently, the interest rate
response will pick up the effects of the anticipated component of fiscal policy - that is, of
changes in fiscal policy expected to occur in the future on the basis of information dated
t and available to the public but not to the econometrician. But whether the impact
effects of government spending shocks too are misestimated depends on subtler issues,
namely the autocorrelation structure of the omitted announcement shock.