What is the term for the behaviour of people as they interact with one another in markets?

Which of the following would be least likely to appear in a listing agreement?

A) negotiable commission clause B) expiration date C) listing price D) estimated closing cost

A nationwide parcel delivery service keeps track of the number of late deliveries (more than 30 minutes past the time promised to clients) per day. They plan on using a control chart to plot their results

Which type of control chart(s) would you recommend? A) both x-bar chart and R-chart B) p-chart C) c-chart D) x-bar chart E) both p-chart and c-chart