This document discusses proving loss of earning capacity for unconventional workers. It defines earning capacity as potential to earn income rather than actual lost wages. Two case studies are presented: (1) A self-employed farmer who suffered a mild traumatic brain injury, where an agricultural expert compared his pre- and post-injury productivity. (2) A college football player whose shoulder injury prevented an NFL career, where an expert estimated probabilities and lengths of NFL careers to calculate lost earnings. The document stresses laying proper foundations for expert testimony on earning capacities.