Monopolistic Competition Model 

You helped me and my friend survive (and hopefully pass) our International Exam! Thank you so much! As we say in Germany, you are an `Ehrenmann`.

I wish you were my international trade teacher :( :(

You're fantastic!!!! Thanks a lot from Italy!!!!! Grazie mille, very helpful :DD

Great explanation as usual

This amazing!!

So good at writing backwards.... HOW

great job sir

Nicely explained.

Absolutely great!

讲得太好啦！thx!

POV: t'as ITT le 21 et t'es grave dans la merde

nice teaching

Quality

Hello Sir ! .. Do you right in a reverse pattern .. I've been thinking about this a lot lately.