Our little capitalist

I took Emily and Kristen (and friends) to the movies on Friday night.  At one point in the movie, Kristen had a dry throat and was coughing.  She asked Emily for a sip of her soda and this is how the conversation went:

 

K:  Can I have a sip of your drink? *cough, cough*

E:  No, I’ve already drank out of it. 

K:  Emily, I’m choking.  I just want a sip.

E:  No, you’ll get your germs on it.

K:  I’ll give you a dollar.

E:  Okay, here you go!