What e-Business revenue model(s) does Amazon.com use? Provide all answers that apply to Amazon.com. Also provide detailed evidence or description on how Amazon uses the revenue model(s).  

The next three questions refer to the following information.    Safelite is a windshield repair company. If your windshield breaks, they send a technician to fix your windshield. Safelight used to pay its technicians a fixed hourly wage of $25/hour, regardless of the number of windshields they fixed. However they thought their technicians would work harder if they were instead paid $50 per windshield replaced.  This is called a piece rate contract. Safelite wanted to test this idea, but the union would not let them change everyone’s pay. So to test their idea, they ran experiment where workers were randomly assigned to a control group or a treatment group. For the control group, there was no change to pay. For the treatment group, workers could choose whether they wanted the fixed hourly wage contract or the piece rate contract. 

What challenge is most clearly present in the experiment?

The graphs below shows data from the company.  Roughly what is the effect of an additional $1,000 of salary offer on the probability of job acceptance?

For many years, a company had a very generous health insurance plan, with no deductible. In 2023, the company introduced a $3000 deductible for all employees, and the company has no information about non-employees. The company wants to know how the deductible affected health care spending. What identification strategy would be most appropriate?

A retail company notices a strong positive correlation between the number of loyalty program members and overall store revenue. For interpreting this correlation as the effect of loyalty program membership on revenue, which of the following would be a confounding factor?

Here are data from the experiment:   Group # People Average cost per windshield replaced Assigned to hourly wage 1000 82 Assigned to treatment, chose hourly wage 500 90 Assigned to treatment, chose piece rate contract 500 54       What is the effect of the piece rate contract, relative to fixed hourly wage, on the cost per windshield replaced?    

Even assuming the union allowed it, what would be a concern about scaling up the piece rate contract by giving it to all employees?

In a patient with an autoimmune disorder, helper T cells become non-functional. Which of the following would be true of this patient’s immune response?

Bernie Madoff went to prison for which of the following types of scam: