Abusiness student conjectures that the internet caused companies to become more profitable, since many transactions previously handled “face-to-face” could now be completed online. the student compares earnings from a sample of companies from the 1980s to a sample from the 2000s. explain why this is an observational study. if indeed profitability increased, can she conclude the internet was the cause? why or why not?

What is the relationship between marginal external cost, marginal social cost, and marginal private cost? a. marginal social cost equals marginal private cost plus marginal external cost. b. marginal private cost plus marginal social cost equals marginal external cost. c. marginal social cost plus marginal external cost equals marginal private cost. d. marginal external cost equals marginal private cost minus marginal social cost. marginal external cost a. is expressed in dollars, so it is not an opportunity cost b. is an opportunity cost borne by someone other than the producer c. is equal to two times the marginal private cost d. is a convenient economics concept that is not real

It is estimated that over 100,000 students will apply to the top 30 m.b.a. programs in the united states this year. a. using the concept of net present value and opportunity cost, when is it rational for an individual to pursue an m.b.a. degree. b. what would you expect to happen to the number of applicants if the starting salaries of managers with m.b.a. degrees remained constant but salaries of managers without such degrees decreased by 20 percent

2. the external environment (connect)choose whether each example belongs in the general, task, or internal environment.exampleenvironmenta worldwide recession task environment / general environment / internal environmentlocal mothers asking their community grocery store to carry no-salt cheerios-type cereal for their babies task environment / general environment / internal environmentchoose the phrase that best completes the following sentence.the relationship between the task environment and the general environment is best described as: a one-way system: changes in the task environment affect the general environment, but changes in the general environment do not affect the task environment.an open system: changes in the task environment affect the general environment, and changes in the general environment affect the task environment.a one-way system: changes in the general environment affect the task environment, but changes in the task environment do not affect the general environment.a closed system: changes in the general environment do not affect the task environment, and changes in the task environment do not affect the general environment.©bloomberg via getty imagesmanagement in the newsin april 2010, the explosion of british petroleum’s (bp) deepwater horizon oil drilling rig and the accompanying oil spill dramatically changed the external environment in which all oil companies operate. the explosion released more oil than any other accidental spill in history and had a huge impact on the waters and surrounding communities of the gulf coast. the conditions that led to the spill, the attempts to stop the spill, and the clean-up and aftermath of the spill prompted debates in the u.s. senate, concern on wall street, and attention from companies all over the world.match each oil spill event with a specific dimension of the general environment.eventgeneral environment dimensionbp stock prices falling 25% during the first month after the oil spill oil seeping into pelican nesting grounds, which will place the brown pelican back on the endangered species list people moving from louisiana to oklahoma to avoid the effects of the spill