EU ETS, the first and most influential carbon trading system established worldwide, often benefits ETSs elsewhere with its experience in policy making and mechanism design, especially conducive for their early-stage development. Researchers and policy makers have drawn a couple of retrospective conclusions on how the market was shaped and its reflection on policy-making. Bayer and Aklin [
5] found that the low carbon prices didn’t eliminate the emission reduction impact of EU ETS. Goulder [
7] pointed out the interaction of regulations from all aspects being a key element for the implementation of cap-and-trade programs in the EU ETS, influencing both the environmental and economic effectiveness. Perthuis and Trotignon’s [
8] analysis emphasized that the carbon price played a major role in deciding the economic efficiency of the policy, and the EU ETS regulations would modify both regulated entities’ and speculative investors’ short-term and long-term market behaviors. More specifically, Martin, Muûls, and Wagner [
9] found that in the early phase of the EU ETS, regulated entities executed trades mostly for compliance purposes, without exploiting the economic opportunities of the permit market to the fullest. With regulated and non-regulated entities both participating in the market, Phase I of EU ETS (2005-2007) showed a diverted carbon price from marginal abatement cost [
10] and was mainly affected by energy prices and weather conditions [
11].