Read this excerpt describing the mission of the World Bank. The World Bank is a vital source of financial and technical assistance to developing countries around the world. It is not a bank in the common sense. Instead, it plays a different but supportive role in its mission of global poverty reduction and the improvement of living standards. It provides low-interest loans, interest-free credit, and grants to developing countries for education, health, infrastructure, communications, and many other purposes. According to this excerpt, what is one major way in which the World Bank differs from a regular bank

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