This is a very interesting paper about trading, with many direct references to poker in the text. The paper examines types of traders, their motivations, and how successful each type of trader is.
This paper is written by a research academic. The parallels he draws between "the trading game" and the game of poker makes for extremely interesting 2+2 reading.
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...we will first discuss poker games. We will then consider trading, for which poker is a good metaphor."
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Here it is:
The Winners and Losers of the Zero Sum Game: The Origins of Trading Profits, Price Efficiency and Market Liquidity