In future communications the committee may adjust upwards its Personal Income threshold to account for population growth and other fundamental factors.

FORBES: Is Quantitative Easing Necessary?

But dams, diversions and recent drought have combined to push the spawning salmon population in the Klamath well below the 35, 000-fish threshold deemed necessary for the river to maintain a sustainable salmon population.

ECONOMIST: Saving the fish of the Klamath river

The threshold for being liable for this levy should be set high enough to exclude most of the working population.

FORBES: Fact and Comment