I need a short response with a source or reference:

Module 1 and 2: What are some questions you have?

We will cover fundamental economic concepts during the first full week of class. Please lead your questions with keywords from the modules when you ask your original questions. Some examples of keywords are:

• Opportunity cost
• Marginal thinking
• Rationality
• Normative vs. Positive
• Scarcity
• Unintended Consequences
• Comparative advantage

The reference:

there is no reference because I just an open letter.