This note addresses the sources of fiscal risk -broadly defined as the
possibility of deviations of fiscal outcomes from projections- as regard
to the medium-term projections of Italy’s public debt that are regularly
reported in budgetary planning documents (e.g. the RPP). An analysis
of historical projection errors covering the 1996-2007 period suggests
that: (i) on average, errors in projecting debt levels were negligible; (ii)
over time, however, there was a tendency to overestimate debt and
deficits in the late 1990s, and to underestimate them in the 2000s; and
(iii) errors in projecting debt variations were heavily influenced by data
revisions (which affect the growth-adjusted initial debt levels) and
failures in predicting stock-flow adjustments. The note presents a debt
projection for 2008-2013 in a hypothetical worst-case scenario that
introduces fiscal risks. This scenario assumes the RPP 2009
budgetary projections are hit by unexpected shocks, whose
magnitude is the standard deviation of historical projection errors.