Bribe Payers Index (BPI) is a measure of how willing a nation's multinational corporations appear to engage in corrupt business practices.
[4] The BPI 2011 ranked 28 of the leading exporting countries on the likelihood that their multinational businesses will use bribes when operating abroad.
The ranking is calculated from responses by businesses to two questions on the World Economic Forum’s Executive Opinion Survey.
The second question is: "In your experience, to what extent do firms from the countries you have selected make undocumented extra payments or bribes?"
Their combined global exports represented 75 percent of the world's total in 2006.