41.  The backbone providers has varied from a single Internet to many services.

42.  The second part tells that backbone providers stepped into the breach of NSFNET by setting up commercial Internet backbone services and they link together.

43.  If only time spent on the Internet was limited, if only information could be taken control of strictly, if only some online services needed paying, then maybe horror stories about people who have been lost in the virtual reality, who have been disconnected to the real world, who have failed their classes because of too much dependence on the Internet, wouldn't exist.

44.  To find a place for herself , a black woman had to do many things such as attaching herself to a light-skinned woman, finding a husband, doing some church services and so on.

45.  Market failure is not market function completely paralyzed and it refers to the market which can't efficient allocation of goods and services.

46.  It is, however, a kind of situation where a given market does not efficiently organize production or allocate goods and services to consumers.

47.  4) Market power exists when one buyer or seller in a market has the ability to exert significant influence over the quantity of goods or services traded, or the price at which they are traded.

48.  When the economical term "market failure" is discussed in microeconomics, the fact that it means a situation with less efficient organization of production and allocation of goods and services to consumers rather than the given market' s totally refusing to function.

49.  2. The governments are supposed to tax and punish the goods that cause social costs and subsidize the factories and firms that produce products and services that have social benefits.

50.  "Market failure" is a term used in microeconomics to describe a situation where the allocation of goods and services by a free market is not efficient.