Provide the theme summaries for the following conversation: 

#Person1#: Hello, 8520388 2.
#Person2#: Hi, this is Maria. Is that Shirley?
#Person1#: Hi, Maria, this is Shirley.
#Person2#: Shirley, do you know today's homework from our economic law class? I have written it on a piece of paper but I can't find it now.
#Person1#: Hold on for a moment please. I'm fetching my textbook.
#Person2#: OK.
#Person1#: Oh, the homework is to explain what economic law is both in broad sense and in narrow sense.
#Person2#: Explain the economic law? An essay question again?
#Person1#: Yes. You can use your textbook for your reference.
#Person2#: Are there any clear answers in the book to this question?
#Person1#: I don't think so, Maria, but I think you can look for information on the Internet.
#Person2#: OK, thank you, Shirley. You are very helpful. I have another question. When does the Economic Law of China come into effect?
#Person1#: Oh, there isn't such a code called economic law. The Economic Law of China is a general concept for several laws.
#Person2#: There isn't such a code?
#Person1#: Yes, it's a general name for several laws related to economics, like Commercial Law, and Law of Central Bank.
#Person2#: Got it. Thank you, Shirley.

Summary: 
Maria calls Shirley to ask about today's homework from the economic law class. Maria also asks about the Economic Law of China but Shirley says there isn't such a code.