In a recent closely contested lawsuit, apex sued bpex for patent infringement. the jury came back today with its decision. the rate of return on apex was ra = 3.9%. the rate of return on bpex was only rb = 3.5%. the market today responded to very encouraging news about the unemployment rate, and rm = 3.6%. the historical relationship between returns on these stocks and the market portfolio has been estimated from index model regressions as:

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The basic difference between macroeconomics and microeconomics is that: a. microeconomics looks at the forest (aggregate markets) while macroeconomics looks at the trees (individual markets). b. macroeconomics is concerned with groups of individuals while microeconomics is concerned with single countries. c. microeconomics is concerned with the trees (individual markets) while macroeconomics is concerned with the forest (aggregate markets). d. macroeconomics is concerned with generalization while microeconomics is concerned with specialization.

Within the relevant range, if there is a change in the level of the cost driver, then a. total fixed costs will remain the same and total variable costs will change b. total fixed costs will change and total variable costs will remain the same c. total fixed costs and total variable costs will change d. total fixed costs and total variable costs will remain the same