# Development of an agent-based speculation game for higher reproducibility of financial stylized facts

## TL;DR

This paper introduces the Speculation Game, an agent-based model extending the Minority Game, which better reproduces most known financial stylized facts through novel features like nonuniform holding periods and a cognitive evaluation world.

## Contribution

The paper presents a new agent-based model that improves the reproducibility of financial stylized facts by incorporating innovative decision-making features.

## Key findings

- Successfully reproduces 10 out of 11 stylized facts
- Enhances model realism with nonuniform holding periods
- Incorporates magnitude of price changes in history

## Abstract

Simultaneous reproduction of all financial stylized facts is so difficult that most existing stochastic process-based and agent-based models are unable to achieve the goal. In this study, by extending the decision-making structure of Minority Game, we propose a novel agent-based model called "Speculation Game," for a better reproducibility of the stylized facts. The new model has three distinct characteristics comparing with preceding agent-based adaptive models for the financial market: the enabling of nonuniform holding and idling periods, the inclusion of magnitude information of price change in history, and the implementation of a cognitive world for the evaluation of investment strategies with capital gains and losses. With these features, Speculation Game succeeds in reproducing 10 out of the currently well studied 11 stylized facts under a single parameter setting.