Abstract
Recently, scientific wildlife management has introduced in Japan. Attention has especially paid on wildlife whose population has been increasing/decreasing, or which causes trouble with human-beings. This article deals with the case where prey has economic value and is treated at the markets, whereas predator has no economic value and causes agricultural/forestry and fishery damages. Theoretical model has been developed and numerical simulation reveals the followings: (1) if the price of the prey increases repidly at the low resource level, crucial resource depletion will occur because producer tries to maximize his revenue., (2) by maintaining prey more than certain level, prey is also protected, and (3) resource conservation is consistent with the increase of consumer surplus.
