medium · Market Microstructure

If the daily return variance of a stock is 0.0009 and the variance of 5-day returns is 0.0036, what does the variance ratio VR(5) suggest about the market microstructure?

  1. The presence of significant transitory volatility or mean reversion.
  2. The fundamental volatility is increasing over time.
  3. The stock exhibits price momentum or positive serial correlation.
  4. The market follows a pure random walk with no frictions.

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