Here's a list of authorities from state supreme courts. Every single one of them says that liquidated damages clauses are unenforceable if they represent a penalty rather than a reasonable measure of actual damages:
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1. H Olsen v. T.A. Tyre General Contractor, Inc., 907 A.2d 146, 2006 WL
2661140, Unpublished Disposition, Del.Supr., August 24, 2006
2. Wisconsin Auto Title Loans, Inc. v. Jones, 290 Wis.2d 514, 714 N.W.2d
155, 2006 WL 1419645, 2006 WI 53, , Wis., May 25, 2006
3. H Delaware Bay Surgical Services, P.C. v. Swier, 900 A.2d 646, 2006 WL
1419394, 24 IER Cases 1239, , Del.Supr., May 22, 2006
4. H Bates Advertising USA, Inc. v. 498 Seventh, LLC, 7 N.Y.3d 115, 850
N.E.2d 1137, 818 N.Y.S.2d 161, 2006 WL 1273810, 2006 N.Y. Slip Op.
03640, , N.Y., May 11, 2006
5. H Board of Educ. of Talbot County v. Heister, 392 Md. 140, 896 A.2d 342,
2006 WL 940680, 208 Ed. Law Rep. 819, 24 IER Cases 702, , Md., April
13, 2006
6. H TAL Financial Corp. v. CSC Consulting, Inc., 446 Mass. 422, 844 N.E.2d
1085, 2006 WL 802472, , Mass., March 31, 2006
7. H BMG Direct Marketing, Inc. v. Peake, 178 S.W.3d 763, 2005 WL 3077425,
49 Tex. Sup. Ct. J. 84, , Tex., November 18, 2005
8. C Sheehan & Sheehan v. Nelson Malley and Co., 121 Nev. 481, 117 P.3d 219,
2005 WL 1906919, , Nev., August 11, 2005
9. H Valence Operating Co. v. Dorsett, 164 S.W.3d 656, 2005 WL 1186289, 162
Oil & Gas Rep. 511, 48 Tex. Sup. Ct. J. 671, , Tex., May 20, 2005
10. C American Car Rental, Inc. v. Commissioner of Consumer Protection, 273
Conn. 296, 869 A.2d 1198, 2005 WL 756772, , Conn., April 12, 2005
11. JMD Holding Corp. v. Congress Financial Corp., 4 N.Y.3d 373, 828 N.E.2d
604, 795 N.Y.S.2d 502, 2005 WL 729150, 2005 N.Y. Slip Op. 02565, ,
N.Y., March 31, 2005
12. S. Brooke Purll, Inc. v. Vailes, 850 A.2d 1135, 2004 WL 1171382, ,
D.C., May 27, 2004
13. C Arrowhead School Dist. No. 75, Park County v. Klyap, 318 Mont. 103, 79
P.3d 250, 2003 WL 22455530, 182 Ed. Law Rep. 915, 20 IER Cases 872,
2003 MT 294, , Mont., October 28, 2003
14. C Carr-Gottstein Properties, Ltd. Partnership v. Benedict, 72 P.3d 308,
2003 WL 21419020, , Alaska, June 20, 2003
15. C Varney Business Services, Inc. v. Pottroff, 275 Kan. 20, 59 P.3d 1003,
2002 WL 31840896, 148 Lab.Cas. P 59,714, 19 IER Cases 861, , Kan.,
December 20, 2002
16. H Lewis v. Premium Inv. Corp., 351 S.C. 167, 568 S.E.2d 361, 2002 WL
1787986, , S.C., August 05, 2002
17. H Progressive Data Systems, Inc. v. Jefferson Randolph Corp., 275 Ga.
420, 568 S.E.2d 474, 2002 WL 1517841, 02 FCDR 2090, , Ga., July 15,
2002
18. H Huntington Eye Associates, Inc. v. LoCascio, 210 W.Va. 76, 553 S.E.2d
773, 2001 WL 755404, 144 Lab.Cas. P 59,356, 18 IER Cases 1303, , W.Va.,
July 06, 2001
19. United Cable Television of Baltimore Ltd. Partnership v. Burch, 354 Md.
658, 732 A.2d 887, 1999 WL 540309, , Md., July 26, 1999
20. H Gordonsville Energy, L.P. v. Virginia Elec. and Power Co., 257 Va. 344,
512 S.E.2d 811, 1999 WL 100444, , Va., February 26, 1999
21. C O'Brian v. Langley School, 256 Va. 547, 507 S.E.2d 363, 1998 WL 774519,
130 Ed. Law Rep. 1358, , Va., November 06, 1998
22. C Wandler v. Lewis, 567 N.W.2d 377, 1997 WL 411495, 1997 SD 98, , S.D.,
July 23, 1997
23. Aurora Business Park Associates, L.P. v. Michael Albert, Inc., 548
N.W.2d 153, 1996 WL 284560, , Iowa, May 22, 1996
24. BankWest, N.A. v. Groseclose, 535 N.W.2d 860, 1995 WL 455499, , S.D.,
August 02, 1995
25. C Van Velson Corp. v. Westwood Mall Associates, 126 Idaho 401, 884 P.2d
414, 1994 WL 587052, , Idaho, October 27, 1994
26. Wallace Real Estate Inv., Inc. v. Groves, 124 Wash.2d 881, 881 P.2d
1010, 1994 WL 544305, , Wash., October 06, 1994
27. Wasserman's Inc. v. Township of Middletown, 137 N.J. 238, 645 A.2d 100,
1994 WL 406939, , N.J., August 02, 1994
28. Brooks v. Bankson, 248 Va. 197, 445 S.E.2d 473, 1994 WL 248434, , Va.,
June 10, 1994
29. C Mason v. Fakhimi, 109 Nev. 1153, 865 P.2d 333, 1993 WL 530299, , Nev.,
December 23, 1993
30. H Loomis v. Lange Financial Corp., 109 Nev. 1121, 865 P.2d 1161, 1993 WL
530904, , Nev., December 22, 1993
31. Lake Ridge Academy v. Carney, 66 Ohio St.3d 376, 613 N.E.2d 183, 1993
WL 187792, 82 Ed. Law Rep. 1181, , Ohio, June 16, 1993
32. C United Air Lines, Inc. v. Hewins Travel Consultants, Inc., 622 A.2d
1163, 1993 WL 112117, , Me., March 31, 1993
33. Phillips v. Phillips, 820 S.W.2d 785, 1991 WL 260013, , Tex., December
11, 1991
34. Highgate Associates, Ltd. v. Merryfield, 157 Vt. 313, 597 A.2d 1280,
1991 WL 197966, , Vt., August 23, 1991
35. H Jessen v. Jessen, 810 P.2d 987, 1991 WL 67057, , Wyo., May 03, 1991
36. C Technical Aid Corp. v. Allen, 134 N.H. 1, 591 A.2d 262, 1991 WL 33844,
, N.H., March 13, 1991
37. Lefemine v. Baron, 573 So.2d 326, 1991 WL 1326, 16 Fla. L. Weekly 27, ,
Fla., January 03, 1991
38. C Christacos v. Blackie's House of Beef, Inc., 583 A.2d 191, 1990 WL
194428, , D.C., December 07, 1990
39. C 301 Dahlgren Ltd. Partnership v. Board of Supervisors of King George
County For and on Behalf of Dahlgren Sanitary Dist., 240 Va. 200, 396
S.E.2d 651, 1990 WL 137911, , Va., September 21, 1990
40. H Joseph F. Sanson Inv. Co. v. 268 Ltd., 106 Nev. 429, 795 P.2d 493, 1990
WL 101021, , Nev., July 18, 1990
41. Pacheco v. Scoblionko, 532 A.2d 1036, , Me., October 30, 1987
42. C Taylor v. Sanders, 233 Va. 73, 353 S.E.2d 745, , Va., March 06, 1987
43. H Koenings v. Joseph Schlitz Brewing Co., 126 Wis.2d 349, 377 N.W.2d 593,
, Wis., November 26, 1985
44. C Prentice v. Classen, 355 N.W.2d 352, , S.D., September 26, 1984
45. Wassenaar v. Panos, 111 Wis.2d 518, 331 N.W.2d 357, 40 A.L.R.4th 266, ,
Wis., March 29, 1983
46. C W.L. Scott, Inc. v. Madras Aerotech, Inc., 103 Idaho 736, 653 P.2d 791,
35 UCC Rep.Serv. 956, , Idaho, October 15, 1982
47. Court Rooms of America, Inc. v. Diefenbach, 425 N.E.2d 122, , Ind.,
September 01, 1981
48. Walter Motor Truck Co. v. State By and Through Dept. of Transp., 292
N.W.2d 321, , S.D., May 21, 1980
49. C Smith v. King, 100 Idaho 331, 597 P.2d 217, , Idaho, July 02, 1979
50. H Fortune Bridge Co. v. Department of Transp., 242 Ga. 531, 250 S.E.2d
401, , Ga., October 18, 1978
51. Truck Rent-A-Center, Inc. v. Puritan Farms 2nd, Inc., 41 N.Y.2d 420,
361 N.E.2d 1015, 393 N.Y.S.2d 365, , N.Y., February 24, 1977
52. C Local 34, State, County and Municipal Emp. of Am. Federation of State,
County and Municipal Emp., AFL-CIO v. Hennepin County, 310 Minn. 283,
246 N.W.2d 41, , Minn., September 17, 1976
53. Southeastern Land Fund, Inc. v. Real Estate World, Inc., 237 Ga. 227,
227 S.E.2d 340, , Ga., July 09, 1976
54. C Growney v. C M H Real Estate Co., 195 Neb. 398, 238 N.W.2d 240, , Neb.,
February 05, 1976
55. C B & L Painting Co., Inc. v. United Pac. Ins. Co., 165 Mont. 259, 527
P.2d 554, , Mont., October 29, 1974
56. Swenson v. File, 3 Cal.3d 389, 475 P.2d 852, 90 Cal.Rptr. 580, 1970
Trade Cases P 73,368, , Cal., October 29, 1970
57. C Dave Gustafson & Co. v. State, 83 S.D. 160, 156 N.W.2d 185, , S.D.,
February 13, 1968
58. Medak v. Hekimian, 241 Or. 38, 404 P.2d 203, , Or., June 30, 1965
59. C Camp v. Cohn, 151 Conn. 623, 201 A.2d 187, , Conn., May 12, 1964
60. C Berger v. Shanahan, 142 Conn. 726, 118 A.2d 311, , Conn., November 15,
1955
61. C Wade & Dunton v. Gordon, 144 Me. 49, 64 A.2d 422, , Me., February 28,
1949
62. C Mid-Continent Life Ins. Co. v. Goforth, 193 Okla. 314, 143 P.2d 154,
1943 OK 244, , Okla., June 15, 1943
63. C Factory Realty Corp. v. Corbin-Holmes Shoe Co., 312 Mass. 325, 44
N.E.2d 671, 166 A.L.R. 384, , Mass., October 29, 1942
64. C Malone v. Levine, 240 Mich. 222, 215 N.W. 356, , Mich., October 03,
1927