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Margin regulation and volatility
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DOI：10.1016/j.jmoneco.2014.12.007.png)
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An infinite-horizon asset-pricing model with heterogeneous agents and collateral constraints can explain why adjustments in stock market margins under US Regulation T had an economically insignificant impact on market volatility. In the model, raising the margin requirement for one asset class may barely affect its volatility if investors have access to another, unregulated class of collateralizable assets. Through spillovers, however, the volatility of the other asset class may substantially decrease. A very strong dampening effect on all assets' return volatilities can be achieved by a countercyclical regulation of all markets. (C) 2015 Elsevier B.V. All rights reserved.
Keyword:
Collateral constraints
General equilibrium
Heterogeneous agents
Margin requirements
Regulation T
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