Eppie's used cars wanted to test whether straight price discounting worked better than a free gift. it ran two different commercials on alternate wednesdays. the first offered 10 percent off the kelley blue book price for any four-wheel-drive vehicle on the lot while the second offered a free tent with the purchase of any four-wheel-drive vehicle at the kelley blue book price. the type of offer was the variable. the number of people that responded to each type was the variable, which would suggest the best strategy for increasing traffic.
a. marketing; dependent variable
b. dependent; independent variable
c. control data; independent variable
d. independent; dependent variable
e. dependent; control data

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The simple interest in a loan of $200 at 10 percent interest per year is

David consumes two things: gasoline (g) and bread (b). david's utility function is u(g, b) = 10g^0.25 b^0.75. use the lagrange technique to solve for david's optimal choices of gasoline and bread as a function of the price of gasoline, p_g, the price of bread, p_b, and his income m. with recent decrease in the price of gasoline (maybe due to external shock such as shale gas production) does david increase his consumption of gasoline? for david, how does partial differential g/partial differential p_g depend on his income m? that is, how does david's change in gasoline consumption due to an increase in the price of gasoline depend on his income level? to answer these questions, find the cross-partial derivative, |partial differential^2 g/partial differential m partial differential p_g.