Prospect Theory and market quality

We study equilibrium trading strategies and market quality in an economy in which speculators display preferences consistent with Prospect Theory (Kahneman and Tversky, [39]; Tversky and Kahneman, [63]), i.e., loss aversion and mild risk seeking in losses. Loss aversion (risk seeking in losses) induces speculators to trade less (more), and less cautiously (more aggressively), with their private information – but also makes them less (more) inclined to purchase private information when it is costly – in order to mitigate (enhance) their perceived risk of a trading loss. We demonstrate that these forces have novel, nontrivial, state-dependent effects on equilibrium market liquidity, price volatility, trading volume, market efficiency, and information production.