The solution to the problem of opportunism that arises is to assign the right to adjust contracts to a higher level, negotiators at this level being less prone to opportunism.
Both the chief spokesperson for the UN and the UN's most visible and authoritative figure in world affairs, the secretary-general often serves as a high-level negotiator.
He is best as a high-level negotiator, and not as comfortable with the nitty-gritty work of helping Afghanistan build an economy.
"I don't comment on Choco Pies," says Tony Namkung, a high-level negotiator who has accompanied Governor Bill Richardson, President Jimmy Carter, and Google's Eric Schmidt to North Korea.
Before the strike is settled, about 35 people on the bargaining committee of the communications workers' union need to sign off on high-level negotiators' progress.
But Naranjo and the other high-level negotiators are in Cuba to make peace, with the backing of Colombia's key counterinsurgency ally, the United States.
Campaigners, journalists and high-level negotiators reported spending up to eight hours standing in crowds outside the metal gates, while a rare pre-Christmas cold spell dumped 10cm of snow on the city.
Last week, as separate teams of high-level negotiators sought solutions to the Greek debt crisis and to the debt-ceiling morass in Washington, gold crossed $1,600 an ounce for the first time ever.
Mr Kulayev also claimed the militants had been ready to let hundreds of children go free if high-level negotiators entered into talks, and that some of the fighters were strongly opposed to taking the children hostage in the first place.
High-level negotiators will provide more details on the Sustainable Development Mechanism at the end of this year in Marrakesh.
Dozens of female CEOs and other high-level women negotiators have told us about their experiences negotiating in traditionally masculine contexts where standards and expectations were ambiguous.
