Which of the following trends has been observed in the world population in terms of aging? A) As nations have advanced economically, birthrates have increased in proportion to the growing world population. B) The world's population aged 80 and over is projected to decrease 233% by 2040. C) People aged 65 and older will soon outnumber children under age 5 for the first time in history. D) The world's population is growing older, but at a slower rate than it did in comparison with the previous two centuries.

4. suppose that pollution in a neighborhood comes from two factories, with marginal benefit curves given by mb1 = 12 – p1 and mb2 = 8 – p2. the level of pollution in the neighborhood is given by p = p1 + p2. the government wants to limit pollution by instituting a pollution-rights market. the government’s desired level of p is 10, so it prints 10 pollution rights and offers them for sale to the firms. a)find the equilibrium selling price of a pollution right, as well as the allocation of rights (and hence pollution levels) across the two factories. b)repeat part (a) for the case where the government’s desired level of pollution equals 14. c)comment on the usefulness of a pollution rights market in achieving efficient levels of pollution abatement.

True or false: a fitted model with more predictors will necessarily have a lower training set error than a model with fewer predictors.

Which of the following statements are false regarding activity-based costing? non-manufacturing costs are important to include when calculating the cost of each product. costs are allocated based on a pre-determined overhead rate. transitioning from traditional costing methods to activity-based costing can be complicated and costly. activity-based costing follows the same basic calculation methods as traditional costing approaches. none of the above