Agglomeration 1 Antitakeover law 1 China 1 Corporate takeovers 1 Data envelopment analysis 1 Eastern China 1 Eco-efficiency evaluation 1 Ecological efficiency 1 Ecological protection 1 Economic and social effects 1 Economic development 1 Economics 1 Efficiency 1 Environmental regulations 1 Information quality 1 Latent Dirichlet Allocation topic model 1 Latent dirichlet allocation topic model 1 Policy control 1 Pollution control 1 Public policy 1 Qualitative comparative analysis 1 Slack-based Measure Data envelopment analysis 1 Slack-based measure data envelopment analyse 1 Statistics 1 Takeover efficiency 1 Urban agglomerations 1 detection method 1 economic development 1 policy approach 1 regulatory framework 1