This article is devoted to the problem of the detection of overt or tacit collusion equilibrium in the context of the choice of the appropriate econometric method, a choice that is determined by the amount of information that the observer possesses. The author addresses this problem in two...

Calyampudi Radhakrishna Rao (Rao for brevity, henceforth) just celebrated his 90th birthday. He received numerous honors including 1972 fellow of Econometric Society and the 2002 US Medal of Science (the citation of which recognized his contributions to economics). He co-founded with Mahalanobis...