Defending against a terrorist who accumulates resources

In this paper we study a two-period game between a government and a terrorist, where the terrorist decides whether to stockpile attack resources from the first to the second period. Our results show that the terrorist chooses stockpiling when: (a) the following parameters are in intermediate ranges: the government's asset valuation, the terrorist's first-period resource, the government's unit defense cost, and the terrorist's unit attack cost; (b) the terrorist's secondperiod resource is small; and (c) the terrorist's resource growth factor or discount factor is large. We also compare our model with the one that does not allow terrorist stockpiling. For moderate growth factors and second-period resources for the terrorist, the terrorist does not prefer the option of stockpiling. The terrorist prefers stockpiling for the more uncommon case that the growth factor for the terrorist's stockpiled resource is very large and the second-period resource is very small. In contrast, the government always prefers that the terrorist has the stockpiling option.