The decision to use the 20 per
cent threshold continues to be controversial because the potential fitness effects of this amount of admixture are unknown, and the threshold used will influence the decision to list by determining the number of populations classified as part of the native taxon (Haig & Allendorf 2006).
If they
continue to add $ 2,400 per month, as they are doing now, then with 3 per
cent growth after inflation it would become $ 998,300 at Terry's age 55, his
threshold for retirement.