medium · LSAT Logical Reasoning
A financial analyst observes that every time the interest rate rises, the stock market declines. Today the stock market did not decline.
Based solely on the analyst's observation, what must be true?
- The interest rate held perfectly steady today.
- The interest rate did not rise today.
- The stock market is certain to decline tomorrow.
- Nothing whatever can be inferred from the observation.
- Any failure of the market to decline must have been caused by some factor other than interest rates.
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