Which market structure has only one company?

A good’s supply is inelastic if the supply is NOT very sensitive to price changes.

An example of an explicit cost is: 

,A firm had sales revenue of $1 million last year. It spent $600,000 on labor, $150,000 on capital and $200,000 on materials. The  firm’s factory sits on land owned by the firm that it could rent for $30,000 per year. What was the firm’s economic profit last year?

An entrepreneur decided to leave a job that pays $50,000 a year to start a business. These lost wages would be considered

A monopolistically competitive uses branding and marketing to create pricing power. 

A 45-year-old is diagnosed with macrocytic, normochromic anemia. The nurse suspects the most likely cause of this condition is:

A 30-year-old presents with hematuria, menorrhagia, and bleeding gums, and is diagnosed with immune thrombocytic purpura (ITP). A nurse realizes the most likely cause is:

 In a study about intervention on smoking, 50 participants are recruited, consisting 25 non-smokers. All people watched an emotive video showing the death from smoking-related cancers have on families. After two days, these people are asked if they remained smokers or non-smokers.  We plan to conduct a McNemar Test, and n = 50 is a large sample.   What’s the value of MN test stat ? 

From the previous problem on MN Test, what is your conclusion ?