How much power do customers have? 300 words

Customers are good; crutches are not.

Delphi Automotive, the giant auto parts supplier, went bankrupt in 2005 despite generating $26 billion in annual revenue. A big reason: It served a few large customers who held so much sway that they could demand price cuts each passing year. (Delphi has since reorganized and went public last November.)
How much power do customers have? 300 words