In order to test the semistrong form of the efficient-market hypothesis, researchers have mostly relied on the:. a. estimation of the serial correlation coefficients (autocorrelations) for securities and markets.
b. measurement of the performance of technical trading strategies over the years.
c. measurement of how rapidly security prices adjust to different news items.
d. All of the options.

Total marketing effort is a term used to describe the critical decision factors that affect demand: price, advertising, distribution, and product quality. define the variable x to represent total marketing effort. a typical model that is used to predict demand as a function of total marketing effort is based on the power function: d = axb suppose that a is a positive number. different model forms result from varying the constant b. sketch the graphs of this model for b = 0, b = 1, 0< b< 1, b< 0, and b> 1. (we encourage you to use excel to do this.) what does each model tell you about the relationship between demand and marketing effort? what assumptions are implied? are they reasonable? how would you go about selecting the appropriate model?