Download the following article by the United Nations Office on Drugs and Crime that references corruption in the Afghan government: http://www.unodc.org/documents/data-and-analysis/Afghanistan/Afghanistan-corruptionsurvey2010-Eng.pdf. 

The report lists in detail different forms of bribery. Using the report, draw up a list of the forms of bribery that may be efficiency enhancing and another list of those that have a negative economic effect. Which bribes might belong to both categories? Justify your classification.