need revision for ECN research paper

Do not change any original word or sentences, please use different color add more words in the end of the paragraph if you think you need. 

Please add three more developed countries under the subtitle "  

Taxation System Approach of Different Countries"  to introduce what kind of tax system for that countries, e.g. Germany Canada and China

(this is the most important )

and add about two page more for this research paper. 

maybe add one more subtitle. 

here is two links has to be following the main topic. 

Effects of Income Tax Changes on Economic Growth https://www.brookings.edu/research/effects-of-income-tax-changes-on-economic-growth/ 

what really is the evidence on taxes and growth? https://www.cbpp.org/research/what-really-is-the-evidence-on-taxes-and-growth 

you only have less then 24 hours to finish that