U.S. exports, imports, and net exports: SM

The purpose of this discussion board is for you to identify how different transactions are classified as imports or exports and how they impact net imports and net exports.

Describe how the following transactions would affect U.S. exports, imports, and net exports: 

1. Students in Prague enroll in an online class that was developed by and is presented by Post University in Connecticut.
2. Mrs. Jones in New York buys a new Alfa Romeo Spider that was made in Italy. At what point is it an import or export?
3. Arts et Métiers ParisTech in Paris buys supplies from Art Warehouse in New Jersey in America.
4. A resident of Mexico crosses the border and buys California avocados. 
5. One of the art teachers from Post University spends the summer touring the alps to present to the class pictures of mountain scenery that they can paint in class.

Please use a presentation format complete with an introduction to global trade, good paragraph structure, and footnotes.