Index Design: Hedging and Manipulation
43 Pages Posted: 6 Apr 2021 Last revised: 8 May 2023
Date Written: January 27, 2021
This paper studies optimal index design to both facilitate hedging and alleviate illegal manipulation in a competitive equilibrium paradigm, modified to deal with manipulation. Specifically, a large trader is trading both derivatives and stocks, and effectively hides her trades behind the competitive market clearing mechanism. Unlike the strategic game paradigm, a volume-weighted average pricing (VWAP) index both introduces basis risk and encourages manipulation because of the additional randomness in volume weight and the greater price impact enjoyed by the large trader. In contrast, an equal-weighted average pricing (EWAP) index both preserves market completeness and discourages manipulation.
Keywords: Index Design, Hedging, Index Manipulation, Hidden Trades, VWAP, EWAP, Competitive Equilibrium
JEL Classification: G12, G14, G18, D84
Suggested Citation: Suggested Citation