answer: Shirley tells Maria about today's homework from their economic law class and tells her there isn't a code called economic law in China.
documents: #Person1#: Hello, 85203882. 
  #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.