Each year, the state of Kentucky invites bids from dairies to supply half-pint containers of fluid milk
Question:
Each year, the state of Kentucky invites bids from dairies to supply half-pint containers of fluid milk products for its school districts. In several school districts in northern Kentucky (called the tricounty market), two suppliersMeyer Dairy and Trauth Dairywere accused of price-fixingthat is, conspiring to allocate the districts so that the winning bidder was predetermined and the price per pint was set above the competitive price. These two dairies were the only two bidders on the milk contracts in the tricounty market for eight consecutive years. Did Meyer and Trauth conspire to rig their bids in the tricounty market? Economic theory states that, if so, the mean winning price in the rigged tricounty market will be higher than the mean winning price in the competitive surrounding market. Data on all bids received from the dairies competing for the milk contracts during the time period in question are saved in the MILK file. A MINITAB printout of the comparison of mean prices bid for whole white milk for the two Kentucky milk markets is shown below. Is there support for the claim that the dairies in the tricounty market participated in collusive practices? Explain in detail.
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Two-Sample T-Test and Cl: WWBID, Market Tuo-sam ple T for UUBID Market SURROUND 254 0.1331 0.0158 0.00099 TRI-COUNTY 100 0.1431 0.0133 0.0013 N Mean StDev SE Mean Difference =mu (SURROUND) -mu (TRI-COUNTY) Estimate for difference: 0.009970 95% upper bound for difference: -0.007232 T-Test of difference = 0 (vs く): T-value # -6.02 p-value = 0.000 DF = 213
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