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Financial Innovation

Table 2 The principle of the DID model

From: Does the carbon emission trading pilot policy promote green innovation cooperation? Evidence from a quasi-natural experiment in China

 

Before the implementation of the policy

After the implementation of the policy

Difference

Treatment group

A + B

A + B + C + D

C + D

Control group

A

A + C

C

Difference

B

B + D

D (difference in difference)

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