In Campbell II, the Wyoming Supreme Court noted that “without such [external cost] adjustments, legislative inaction appears inevitable, and, ultimately, funding of education will be below cost, in contravention of the constitution.” State v. Campbell Cnty Sch. Dist., 2001 WY 19, ¶ 88, 19 P.3d 518 (Wyo. 2001). The court determined that schools must be funded at the actual cost of education and adjust that amount yearly for inflation. This adjustment is referred to as an external cost adjustment (ECA).
In 2009, the Wyoming Legislature stopped providing an ECA. Thanks to a group of dedicated lawmakers, that is set to change.