共享几本曼昆教材的英文原版
（1）Principles of Economics, 7th edition
（2）Mankiw's Principles of Macroeconomics, 7th edition plus 6-months instant access to MindTap Economics.
（3）Principles of Microeconomics, 7th Edition
（4）Brief Principles Of Macroeconomics 6th- N. Gregory Mankiw
（5）Macroeconomics.8th.edition