Colombian supply curves slope upwards

The most shocking revelations were that soldiers killed civilians and dressed them up as guerrillas to inflate their body counts. In return, they received benefits and promotions. Last year, a tribunal identified more than 6,400 of these so-called “false positive” killings dating from the 2002-2010 rule of hawkish rightwing president Álvaro Uribe, who is under investigation in an unrelated case and could come under further scrutiny with Velásquez as minister.

Here is more from the FT.  This is also an object lesson in why we do not use direct incentives to achieve all tasks.