In South Africa, what was in origin a relatively minor distortion in the compilation of the CPI produced a downward revision, when it was discovered, of nearly 2 percentage points in the 12-month rate of inflation. This at least had the merit of being a rare example of a good news shock.
Such events are not unique to emerging market economies: the UK and others have experienced problems with important statistical series from time to time. But diverting scarce resources to statistical compilation is inevitably a problem in an economy where the relevant skills are often a key constraint on economic development as whole.