Holland v. Earl G. Graves Publishing Co.
United States District Court for the Eastern District of Michigan
46 F.Supp. 2d 681 (1998)
Each fiscal year, Graves (defendant) gave employee Sharon Holland (plaintiff) a compensation package offering a year-end bonus tied to hitting a set revenue goal. At some point Holland's revenue goal was increased, though the parties disputed whether that happened mid-year or was applied retroactively after the fiscal year ended; Holland never agreed to the change. Holland sued, arguing the original compensation package was an offer for a unilateral contract that, once she began performing, could no longer be unilaterally altered.
Whether, once one party to a unilateral contract begins substantially performing on it, the other party may modify the contract without the mutual assent of both parties.