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The source, date and limitation will stay beside the answer.
Which commodity changed more?
Choose two commodities and turn their shared history into a plain-language comparison.
Start here
The idea in plain language.
Put two price histories on the same starting line. The tool changes both first values to 100, so you can compare percentage movement even when the original units are different.
- Choose two markets Pick any two commodities with stored history.
- Match the dates Only observations shared by both series are compared.
- Measure the change The larger percentage move wins the price race.
Try it with your own choices.
Change an input and build a short explanation you can read, check and share.
What the answer means—and what it does not.
These checks stop a useful shortcut from turning into a misleading claim.
Why start at 100?
Gold may be priced per troy ounce while oil is priced per barrel. Indexing removes that unit mismatch and compares movement instead.
What is a shared period?
The comparison begins on the first date and ends on the last date that both selected series have in common.
What does it not prove?
A bigger move does not explain the cause, predict the next move or show which market was a better investment.
Worked example
A simple two-market example
If one indexed series ends at 120 and another ends at 108, the first rose 20% while the second rose 8% over the same dates.
Illustrative arithmetic. It is not a current quote, forecast or transaction offer.- First series
- +20%
- Second series
- +8%
- Difference
- 12 points
Check the evidence and keep exploring.
A short story is a starting point. Open the underlying data, method or full tool before using the answer in a decision.
Open the full comparison workbench Compare up to six histories, dates and units.
Inspect the original history Download the observations behind a comparison.
Check the data method See frequencies, sources and update rules.