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Inertial inflation is a situation where all prices in an economy are continuously adjusted with relation to a price index by force of contracts.
Changes in price indices trigger changes in prices of goods. Contracts are made to accommodate this price-changing scenario by means of indexation. Indexation in a high-inflation economy is evident when, for instance, a given price must be recalculated at a later date, incorporating inflation accumulated over the period to "correct" the price. In other cases, local currency prices can be expressed in terms of a foreign currency. At some point in the future, prices are converted back from the foreign currency equivalent into local currency. This conversion from a "stronger" currency equivalent value (i.e. the foreign currency) is intended to protect the real value of goods, as the nominal value depreciates.
In the medium-to-long term, economic agents begin to forecast inflation and to use those forecasts as de facto price indexes that can trigger price adjustments before the actual price indices are made known to the public. This cycle of forecast-price adjustment-forecast closes itself in the form of a feedback loop and inflation indices get beyond control since current inflation becomes the basis for future inflation (more formally, economic agents start to adjust prices solely based on their expectations of future inflation). At worst, inflation tends to grow exponentially (leading to hyperinflation).