Micro 1.5 Opportunity Cost 

Thank you, thank you, and thank you. I just wanna let you know this, the future of my grades depends on these videos. This is from an international student living in NYC.

thank you sir

7:42 Less than Greater than sign error

can we address the fact that the cost of going to the movies was NINETY DOLLARS yet GASOLINE was only FIVE🤣🤣🤣🤣