In trying to understand the evacuation of the World Trade Center when it was first bombed in 1993, B. E. Aguirre, Dennis Wenger, and Gabriela Vigo argue that the more "the search for meaning in the milling process focuses upon defining the situation as serious, the quicker should be the mobilization of people and the initiation of collective behavior." What type of theory are they using to make this prediction?

Wo firms, a and b, each currently dump 50 tons of chemicals into the local river. the government has decided to reduce the pollution and from now on will require a pollution permit for each ton of pollution dumped into the river. it costs firm a $100 for each ton of pollution that it eliminates before it reaches the river, and it costs firm b $50 for each ton of pollution that it eliminates before it reaches the river. the government gives each firm 20 pollution permits. government officials are not sure whether to allow the firms to buy or sell the pollution permits to each other. what is the total cost of reducing pollution if firms are not allowed to buy and sell pollution permits from each other? what is the total cost of reducing pollution if the firms are allowed to buy and sell permits from each other? a. $3,000; $1,500 b. $4,500; $3,500 c. $4,500; $4,000 d. $4,500; $2,500