Tariff indexation.
This mechanism is similar to a cost pass-through but uses a different
tool to make the adjustment. Rather than the actual costs of the service, the tariffs are
adjusted to reflect a change in an index of prices (such as the consumer price index), on a
regular timetable. While indexation may protect the provider from price increases that are
predictable and within normal limits, the provider is still vulnerable to changes outside the
norm or outside the index. In some cases, the indexation formula is based on a basket of
prices most relevant to the service being provided.
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