Economics: opportunity costs: suppose on friday night you have a choice to go either to a katy perry concert or a lady gaga concert. you won a free ticket to see katy perry. you would pay as much as $200 to see lady gaga perform, but tickets to her show cost $100 . assume that you end up going to the katy perry concert.

since you went to the katy perry concert, you must be willing to pay at least $ to see katy perry.

The card shoppe needs to maintain 21 percent of its sales in net working capital. currently, the store is considering a four-year project that will increase sales from its current level of $349,000 to $408,000 the first year and to $414,000 a year for the following three years of the project. what amount should be included in the project analysis for net working capital in year 4 of the project?

Google started as one of many internet search engines, amazon started as an online book seller, and ebay began as a site where people could sell used personal items in auctions. these firms have grown to be so large and dominant that they are facing antitrust scrutiny from competition regulators in the us and elsewhere. did these online giants grow by fairly beating competition, or did they use unfair advantages? are there any clouds on the horizon for these firms -- could they face diseconomies of scale or diseconomies of scope as they continue to grow? if so, what factors may limit their continued growth?

Which factor determines who a society will produce goods and services for?