V-Lab
General Motors Co Asymmetric ILLIQ Liquidity Analysis
Illiquidity prediction for Tuesday, September 22nd, 2026
1 Day
30.56
decreased by 1.22
1 Week
31.15
decreased by 0.63
1 Month
30.84
decreased by 0.94
Analysis last updated: Monday, September 21, 2026 at 09:43 PM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Nov 18, 2010 to Sep 18, 2026Model Insight
With persistence 0.991, illiquidity shocks have a half-life of 78 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Asymmetry: illiquidity responds almost entirely to negative returns
μ
ILLIQ-AMEM Model
Tap to view equation
High persistence: persistence 0.991, shock half-life ~78 daysAsymmetry: illiquidity responds almost entirely to negative returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.3187 | 2.61*** |
| αARCH | 0.0130 | 1.59 |
| βGARCH | 0.9385 | 138.11*** |
| γleverage | 0.0794 | 4.30*** |
0.991
Persistence78d
Half-lifeμ
ILLIQ-AMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.3187 | 2.61*** |
α ARCH Response to squared shocks | 0.0130 | 1.59 |
β GARCH Volatility persistence | 0.9385 | 138.11*** |
γ leverage Additional response to negative shocks | 0.0794 | 4.30*** |
Persistence:
0.991
Half-life:
78 days
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