Law, Economics & Statistics
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August 4, 2017439 Law, Economics & Statistics Spring 2015
Economics 439 Law, Economics & Statistics Spring 2015 Prof. Kathie Barnes Midterm Take-Home Exam Please note that the Honor Code applies to this exam Do NOT discuss the exam, work with others or obtain help from others in completing this exam question. 1. LCD Monitor Anti-trust case The Department oqustice (Do)) is investigating HP for conspiring with LCD monitor manufacturers to artificially raise the price of monitors that they sell with desktop computers. They have strong evidence that the conspiracy started in August 2005, and ended in January 2007. They are trying to find the total amount that HP was able to overcharge during this time period. The DO] has data on the total sales (in thousands of dollars) of monitors for each month between January 2005 and December 2007 for both HP, and Acer, which was not a part ofthe conspiracy. A. Create a measure of how much the HP overcharged (in total) per month during the conspiracy. Explain any assumptions you are making. You may want to take into account the following: a. Sales of monitors are traditionally higher in August & September for the start of school, and in December because of Christmas. b. All computer companies have seen their sale of desktop computers drop over time as more and more consumers choose laptop computers (which do not have LCD monitors). B. Provide an estimate of the total amount HP overcharged consumers during the entire 18 month conspiracy. C. Provide a 95% confidence interval as bounds for your total found in part B. Remember to EXPLAIN what you are doing, and why. Email your final answer to me at: [email protected] by 5pm MST (Tucson Time) Friday. Ifyou are unable to email me your answer, you can drop it off at Law Rm 210 (faculty assistants) until 5pm. Note that the second floor of the law school locks automatically at 5pm sharp, so you can’t be late! Include in your answer all calculations you made, either by attaching the excel spreadsheet (or log file for Stata) to the email, or printing it out.
Month Seller Total_Sales Month Seller Total_Sales
Jan-2005 HP 290824 Jan-2005 Acer 335314
Feb-2005 HP 322059 Feb-2005 Acer 330075
Mar-2005 HP 294593 Mar-2005 Acer 319450
Apr-2005 HP 299633 Apr-2005 Acer 315772
May-2005 HP 272018 May-2005 Acer 305127
Jun-2005 HP 281315 Jun-2005 Acer 324702
Jul-2005 HP 280747 Jul-2005 Acer 311380
Aug-2005 HP 458142 Aug-2005 Acer 381264
Sep-2005 HP 375035 Sep-2005 Acer 334663
Oct-2005 HP 309355 Oct-2005 Acer 305822
Nov-2005 HP 327711 Nov-2005 Acer 287949
Dec-2005 HP 456506 Dec-2005 Acer 347807
Jan-2006 HP 317482 Jan-2006 Acer 303182
Feb-2006 HP 328067 Feb-2006 Acer 292840
Mar-2006 HP 321012 Mar-2006 Acer 301249
Apr-2006 HP 326483 Apr-2006 Acer 275076
May-2006 HP 316931 May-2006 Acer 265413
Jun-2006 HP 289260 Jun-2006 Acer 265582
Jul-2006 HP 309149 Jul-2006 Acer 286118
Aug-2006 HP 420157 Aug-2006 Acer 328732
Sep-2006 HP 345702 Sep-2006 Acer 291343
Oct-2006 HP 298486 Oct-2006 Acer 278983
Nov-2006 HP 286682 Nov-2006 Acer 264530
Dec-2006 HP 389410 Dec-2006 Acer 319120
Jan-2007 HP 280358 Jan-2007 Acer 259740
Feb-2007 HP 251234 Feb-2007 Acer 254084
Mar-2007 HP 235999 Mar-2007 Acer 271715
Apr-2007 HP 239748 Apr-2007 Acer 262205
May-2007 HP 240845 May-2007 Acer 246004
Jun-2007 HP 231578 Jun-2007 Acer 253979
Jul-2007 HP 250427 Jul-2007 Acer 242102
Aug-2007 HP 270813 Aug-2007 Acer 267226
Sep-2007 HP 272242 Sep-2007 Acer 262497
Oct-2007 HP 216063 Oct-2007 Acer 212601
Nov-2007 HP 185808 Nov-2007 Acer 236073
Dec-2007 HP 303301 Dec-2007 Acer 260296
