I study the constrained efficient allocations of a simple model of risk sharing and capital flows across countries assuming that each country cannot commit to fully repay its contract obligations. In the model, the degree of risk sharing and the amount of investment are interdependent. It is...

In complete markets economies (Sandroni [15]), or in economies with Pareto optimal outcomes (Blume and Easley [9]), the market selection hypothesis holds, as long as traders have identical discount factors. Traders who survive must have beliefs that merge with the truth. We show that in...

Risk a basic parameter of portfolio selection and its modelling involves some difficulties. Thus, more and more researchers try to find a solution to this problem proposing other measures than the classic ones used in portfolio selection. On the other hand, Multicriteria Decision Aid has known a...

Proposals and recommendations have been made in a number of reports in an attempt to encourage firms to adopt of "best practice", as identified by the Group of Thirty, through public disclosure requirements and rules for determining the amount of regulatory capital to support trading and...

We study financial markets in which both rational and overconfident agents coexist and make endogenous information acquisition decisions. We demonstrate the following irrele- vance result: when a positive fraction of rational agents (endogenously) decides to become informed in equilibrium,...

We propose a quantum-like description of markets and economics. The approach has roots in the recently developed quantum game theory. Quantum Zeno paradoxes and noncomutative quantum mecanics are also discussed.

I use Google News TM to study the relation between news volumes and stock market volatilities. More than nine million stock market-related news stories in English and (Mandarin) Chinese are collected and the dynamics of the news volume and the stock market volatility is compared in both the...

We present a stylized model of the over-the-counter (OTC) markets in the tradition of Duffie, Gârleanu, and Pedersen 2005 with three distinctive features: (i) Buyers' willingness to pay is private information. (ii) Dividends depend on the state of the macro economy. (iii) Sellers become...

We survey the textual sentiment literature, comparing and contrasting the various information sources, content analysis methods, and empirical models that have been used to date. We summarize the important and influential findings about how textual sentiment impacts on individual, firm-level and...

This paper presents a generalized serial covariance spread pricing model that unifies and improves existing spread models. We analyze three cost components of spread: order processing, adverse information, and inventory holding costs. We modify Stoll's (1989) model by incorporating a two-period...