Consider two types of cars: gasoline-powered cars and electric cars.
because conventional gasoline-powered cars burn fuel during their operation, people who drive gasoline-powered cars impose a /negative) externality on the society. a policy implication of this result is a (tax on/subsidy for) those who drive gasoline-powered cars.
because electric cars reduce greenhouse gas emissions, people who drive electric cars impose a (positive/negative) externality on the society. a policy implication of this result is a (subsidy for/tax on) those who drive electric cars.

What does the phrase limited liability mean in a corporate context?

Afirm that makes electronic circuits has been ordering a certain raw material 250 ounces at a time. the firm estimates that carrying cost is i = 30% per year, and that ordering cost is about $20 per order. the current price of the ingredient is $200 per ounce. the assumptions of the basic eoq model are thought to apply. for what value of annual demand is their action optimal?

Google started as one of many internet search engines, amazon started as an online book seller, and ebay began as a site where people could sell used personal items in auctions. these firms have grown to be so large and dominant that they are facing antitrust scrutiny from competition regulators in the us and elsewhere. did these online giants grow by fairly beating competition, or did they use unfair advantages? are there any clouds on the horizon for these firms -- could they face diseconomies of scale or diseconomies of scope as they continue to grow? if so, what factors may limit their continued growth?