which businesses might rely on one or two key participants ?in what way is dependence a negative quality ?

Social computing forces companies to deal with customers as opposed to

You meet that special person and get married. amazingly your spouse has exactly the same income you do 47,810. if your tax status is now married filing jointly what is your tax liability

(a) what was the opportunity cost of non-gm food for many buyers before 2008? (b) why did they prefer the alternative? (c) what was the opportunity cost in 2008? (d) why did it change?