It is unlikely that many clear-cut examples of monopsonistic exploitation exist in the real world because
a. labor is mobile and will not be exploited forever.
b. new firms will enter a market in which wages are below normal to take advantage of the low-cost labor. This erodes the monopsony.
c. evidence shows that high profits do not correlate with low wage payments. Therefore, low wage rates may be due more to low productivity than to monopsonistic exploitation.
d. all the above are true.
Answer: d. all the above are true.