Consider the special panel case where T = 2. If some of the omitted variables, which you hope to capture in the changes analysis, in fact change over time, then the estimator on the included change regressor
A) will be unbiased only when allowing for heteroskedastic-robust standard errors.
B) may still be unbiased.
C) will only be unbiased in large samples.
D) will always be unbiased.
Ans: B) may still be unbiased.
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The table below shows how the payoffs to two political candidates depend on whether the candidates run a positive or negative campaign. The payoffs are given in terms of the percentage change in the number of votes received. 
Running a negative campaign is ________ for the ________ candidate.
A. a dominant strategy; Democratic B. neither a dominant nor dominated strategy; Republican C. a dominated strategy; Democratic D. a dominated strategy; Republican
The downfall of the fooling model is that it assumes an implausibly ________ level of perception about price on the part of ________
A) high, firms B) high, workers C) low, firms D) low, workers
Under the Clayton Act, horizontal mergers by stock acquisition were:
a. not considered. b. illegal if they could be show to lessen competition. c. illegal under any circumstances. d. legal if they could be shown to lessen competition.
Figure 4-16
Assume that Figure 4-16 shows the supply of new houses. An improvement in the technology for building houses will shift supply from
a.
S1 to S2.
b.
S2 to S1.
c.
S3 to S2.
d.
S3 to S1.