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Y Street — Compounding Knowledge and WealthOctober 29, 2026

Invested 100 hundred-million won, then bought more! Major changes start in November (11) / Quarterly Park Se-ik (Part 1)

An independent exercise, not a statement by the video creator or verification of every claim in the video.

Can the price index rise while inflation slows?

This uses hypothetical index values to separate base effects. If the index was 100 in the same month a year earlier and is 110 now, year-over-year inflation is 10%. Suppose the next month’s year-earlier comparison rises to 105 and its current index is 111: year-over-year inflation falls to approximately 5.71%. Yet the current index has increased from 110 to 111, or approximately 0.91%. Slower year-over-year inflation is different from a falling price level; check both the numerator and the comparison base.

Check for yourself

  1. How can you distinguish a lower year-over-year inflation rate caused by falling current prices from one caused by a higher year-earlier comparison base?

Limits of application

These are invented index values, not a CPI forecast. The month-to-month comparison is a simple unadjusted calculation; actual inflation analysis must align item weights, seasonality and adjustment methods. This calculation alone cannot predict policy rates or share prices.

What to look for
Follow how near-term semiconductor results, market expectations and longer-term supply forecasts can operate on different timelines. Distinguish the guest’s trading experience from predictions based on seasonality.
Why it matters
Check whether additional purchases lower average cost while increasing total loss exposure, and how much an earnings announcement changes prior expectations. For inflation forecasts, distinguish the year-over-year growth rate from the index level when assessing a rate scenario.

Timeline

7 segments
  1. The guest expects foreign buying and semiconductor strength based on a seasonal pattern from autumn through spring. Historical average seasonality differs from actual inflows at a particular time, and a higher beta is not a guaranteed multiple of an upward move. Comparing strategy returns requires consistent samples, dividends, returns on idle cash and costs.

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Educational information only; not investment advice.