最近似乎研究国贸的 尤其是二元边际的都开始跪求 CEPII BACI的数据了。

但我想 似乎不是那么简单就能求到的 因为这个数据库需要机构或者个人花重金买了UN Comtrade的权限，然后 就免费了。

可以仔细研究一下就立刻明白
注册界面有这个提示：

Declaration	I declare on my honor that my institution is a subscriber to COMTRADE. I claim any legal responsibility for a false declaration. I agree that my information may be sent to COMTRADE for verification.

然后你点进

Authorization code Click here

然后你就会发现提示了：

Home Data Query Data Availability Metadata & Reference Subscription & Support Fast tracks Home

You don't have enough right to access this page ... To send the error report to us Please include all of the error messages and a brief description of what you did to produce the error. Note This error has been automatically recorded in our database to be investigated further.

再进上面的工具栏subscription & Support——sub online
你就会看到一个定价表

Premium access to UN ComtradeThere are occasions when a user may require premium service to obtain trade data. These could include bulk download of millions of records or special professional assistance. In this regard, a fee will be charged to cover the costs of providing such services.

Option* User Access Records Limit Limit per query Annual Fee My Comtrade Single User unlimited 50,000 US $121.30 Premium Individual License Single User unlimited 20,000,000 US $909.75 Premium Site License Multiple Users unlimited No limit** US $6,065.00

*All premium access options have a time frame of one year counting from the day of activation. **When data are streamed via web services.

页面最下方有一堆橙色的提醒

Free access to BACI database (for Premium Individual License and Site License)BACI database is an international trade database from CEPII

综上所述，只有拿到Premium Individual License（不差钱的学术大咔，每年费用900刀）或者Premium Site License（有学术抱负的科研机构，每年费用6000刀）才可以免费进BACI数据库。亲们！注意，有效期从激活开始一年内有效啊！！！

祝各位科研顺利！