Heterogeneity in Human's Infomation Process and Reasoning.

1. Difference in model of beliefs.
1.1 Difference in beliefs of prior probability distribution.
1.2 They may know or may not know others belief system.

2. Difference in cognitive ability. Possibility correspondance P(omega)

Difference in memory.

3. Difference in reasoning ability

Research topics

1. Nonpartitional information structure
Relaxing the properties of Relation : 1. reflexive, 2. transitive, 3. symmetric;
(John Geanakoplos, Dov Samet, Rubinstein, Reasoning about knowledge)

2. Simulation of market trading with incomplete informaiton. (Sergiu Hart and Yair Tauman's paper)

3. Neuronscience and information structure and reasoning.

4. Compare the capital gain tax and stamp tax of financial investment.

5. Software Pricing.

6. Mechanism design. Auction and procurement.

7. Other topics in IO.

8. Empirical Rational Expectation. (Hugo and Debra's paper)