a. Over the last 60 years, what expenditure category has had the largest relative weight on U. S. GDP? And the smallest? b. How did World War II (1939-1945) affect the composition of GDP according to the expenditure approach? Why would that be so? c. What does it mean, in economic terms, that the ratio of net exports to overall GDP turned from positive to negative sometime in the mid-1970s? d. Compare the evolution of gross private domestic investment and of government consumption expenditures and gross investment during the 2007-2009 recession. Do they move in the same, or in opposite directions? Why would that be so?

Email viruses are typically launched by people who modify header information to hide their identity. brightmail's enrique salem says that in the future, your email reader will authenticate the sender before putting hte message in your inbox. that way, you will know the source of all the emails you read. alan nugent of novell says, "i'm kind of a fan of eliminating anonymity if that is the price for security." will eliminating anonymity make computers more secure?

When you hire an independent contractor you don't have to pay the contractors what

Employees at a library check out books to patrons. books have an isbn and a name. the library sometimes has multiple copies of the same book. books have one or more authors. a patron is an individual who has an active (non-expired) library card. for each library card, we store the person's first and last names and their address. for each employee, we store their employee id, current salary, first and last name and their address. we also store the employee id of their current manager. each time we check out a book to a patron we need to store the date of the transaction, the employee who checked out the book to the patron, and the library card of the patron. some employees have library cards. if an employee patron turns in a book late, the fine that they pay is a percentage of their salary. some employees are authors who have library cards—they are allowed to check out as many books as they like.