Who really benefits from the ‘best 25 years’ rule?

In the current debate on pension reform, one argument is frequently put forward by opponents of the reform: the abolition of the ‘best 25 years’ rule and the move to take the entire career into account will, on the one hand, reduce everyone’s pensions and, on the other, put those with patchy careers at a particular disadvantage. In reality, this change could help to distribute the budget for pensions more fairly amongst individuals.