Margin trade, short sales and financial stability

Hui Ying Sng (), Yang Zhang and Huanhuan Zheng
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Hui Ying Sng: Nanyang Technological University

Journal of Economic Interaction and Coordination, 2020, vol. 15, issue 3, No 6, 673-702

Abstract: Abstract We model how leveraged trading activities constrained by dynamic funding availability affect financial stability. In the market, customers trade based on the fundamental value of the risky asset and make full payment for their transactions, while speculators take trading position based on margin, which is constantly adjusted by the financier, the fund provider, according to the price volatility. As a result of equilibrium price discontinuity triggered by dynamic margin requirements, trivial shocks to external supply, wealth or fundamental value can be transmitted into asset price crashes or jumps. We find that tightening margin requirements improves (mitigates) the market liquidity in the bull (bear) market, and that imposing short sale constraints helps prevent the price from falling further when the asset is sufficiently under-priced and accelerate price collapse when the asset is over-priced.

Keywords: Margin requirement; Financial stability; Speculation; Leverage (search for similar items in EconPapers)
JEL-codes: D53 G12 (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (1)

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DOI: 10.1007/s11403-019-00256-3

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