V-Lab
Simon Property Group Inc Spline ILLIQ Liquidity Analysis
Illiquidity prediction for Monday, September 21st, 2026
1 Day
29.12
decreased by 1.21
1 Week
30.48
increased by 0.15
1 Month
33.93
increased by 3.60
Analysis last updated: Friday, September 18, 2026 at 11:47 PM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Dec 14, 1993 to Sep 18, 2026Model Insight
With persistence 0.997, illiquidity shocks have a half-life of 210 trading days (~0.8 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
μ
ILLIQ-SMEM Model
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High persistence: persistence 0.997, shock half-life ~210 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.1928 | 8.85*** |
| αARCH | 0.0535 | 11.58*** |
| βGARCH | 0.9432 | 185.38*** |
Spline Coefficients
K=3
| γ1 | -0.0322 | -4.79*** |
| γ2 | 0.0557 | 4.82*** |
| γ3 | -0.0346 | -3.20*** |
0.997
Persistence210d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.1928 | 8.85*** |
α ARCH Response to squared shocks | 0.0535 | 11.58*** |
β GARCH Volatility persistence | 0.9432 | 185.38*** |
Spline Coefficients
K=3
| γ1 | -0.0322 | -4.79*** |
| γ2 | 0.0557 | 4.82*** |
| γ3 | -0.0346 | -3.20*** |
Persistence:
0.997
Half-life:
210 days
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