hard · Quantitative Finance

If two assets are cointegrated, the spread is stationary. If the spread is modeled as x_t = φ x_t-1 + ε_t, what is the condition on φ for the spread to have a finite, positive half-life?

  1. 0 < φ < 1
  2. Φ < 0
  3. Φ > 1
  4. Φ = 1

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