Jack, jamie, ronnie, and stephan own the only computer software manufacturing companies in the country. when jack increases the price of his product and advertises extensively to promote it, the other three manufacturers immediately increase their prices and launch promotional strategies. what type of market structure do these four companies operate in?

Ahigh school teacher wants to study the seating habits of students in the cafeteria to determine if students sit in the same seats or change seats from day to day. she sits in the cafeteria for several days, and without interacting with the students, records where they sit each day. what is a potential benefit of this type of research? there is an independent variable. there is a dependent variable. the researcher can gain personal information about an individual. the participants act normally. the information can be gathered over a period of several years.