The current status and development of emission trading are introduced through aspects like reduction target, participants, initial allocation, accounting, etc. Characteristics of carbon credit as a special commodity in carbon trading are induced through its processes of accumulation, circulation and consumption. Inter-relationship among emission trading, physical law of power system and economic performance of power market are discussed. Factors that introduce difficulties in corresponding researches are highlighted, including multi-timescale dynamics, massive uncertainties, multi-player game and cross-discipline interaction. The implementation of experimental economics under the generalized congestion framework are emphasized and suggested for further researches.%从减排对象、体系成员、初始分配和排放核算等方面介绍排放权交易的现状和发展；归纳碳交易体系中碳信用的积累、流通和消费.讨论排放权交易与电力系统物理规律及电力市场经济特性的交互关系.指出多时间尺度动态、大量不确定性、多方博弈及多领域交互等因素在排放权交易研究中引入的难度,并强调在广义阻塞的框架中采用实验经济学方法的研究思路.
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