Explain whether each of the following is a positive or negative externality.

smoking on campus exposes students to secondhand smoke.

• college graduates add to the nation's supply of skilled workers and add to productivity.

• biotech firms invent new medicines.

• using energy-saving light bulbs reduces the pollution from electricity-generating plants.

• crowded freeways with heavy truck usage expose the surrounding communities to increased health risks.

• restoring the amazon forest can reduce global levels of pollution.

What is overdraft protection (odp)? a.) a cheap and easy way to always avoid overdrawing a bank account b.) a service to automatically transfer available funds from a linked account to cover purchases, prevent returned checks and declined items when you don’t have enough money in your checking account at the time of the transaction. c.) an insurance policy sold by banks to prevent others from withdrawing your money d.) a service provided by the government that insures individuals bank deposits up to $250,000

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.

Expert computers was started in 2018. the company experienced the following accounting events during its first year of operation: started business when it acquired $40,000 cash from the issue of common stock. purchased merchandise with a list price of $32,000 on account, terms 2/10, n/30. paid off one-half of the accounts payable balance within the discount period. sold merchandise on account for $28,000. credit terms were 1/20, n/30. the merchandise had cost expert computers $16,000. collected cash from the account receivable within the discount period. paid $2,100 cash for operating expenses. paid the balance due on accounts payable. the payment was not made within the discount period. required record the events in a horizontal statements model below. in the cash flows column, use the letters oa to designate operating activity, ia for investing activity, fa for financing activity, or nc for net change in cash. if the account is not affected by the event, leave the cell blank. the first event is recorded as an example. what is the amount of gross margin for the period? what is the net income for the period?