Cost per action refers to

a. a fixed amount of money paid to the site for placement of the ad.
b. a fixed amount of money paid to the site for every time a visitor clicks on the ad.
c. a fixed percentage the site gets paid for placing the ad.
d. a fixed amount of money paid to the site for every sale that originated from an ad posted on that site.

If delta airlines were to significantly change its fare structure and flight schedule to enhance its competitive position in response to aggressive price cutting by southwest airlines, this would be an example ofanswers: explicit collusion. tacit collusion. competitive dynamics. a harvest strategy.

Email viruses are typically launched by people who modify header information to hide their identity. brightmail's enrique salem says that in the future, your email reader will authenticate the sender before putting hte message in your inbox. that way, you will know the source of all the emails you read. alan nugent of novell says, "i'm kind of a fan of eliminating anonymity if that is the price for security." will eliminating anonymity make computers more secure?

Arival company manufactures fuel tanks for cars using a different production technique. the total weekly cost (in dollars) of producing x tanks is given by c(x) = 10000 +90x - 0.04x2 find the marginal cost at a production level of 500 fuel tanks per week to approximate the cost of the 501st unit (round to the nearest 2 decimal places, if needed)