United policy of Montenegro and Serbia towards international financial, commercial and political institutions that is to start after signing of the Agreement would cause great problems and would demand external arbitrage, said director of the Centre for transition, Nebojsa Medojevic. He said that these two states would have to fulfil conditions for admittance to membership in these institutions and European Union, as well as their requests in making of concrete agreements. "It is real to expect that EU, due to possible problems, would appoint some high representative as a guarantee for the Agreement, and he would implement it and have a role of an arbiter in situations were agreement of Serbia and Montenegro is not possible about elements of economic policy," claims Medojevic. He explained that it could happen in adjustment of customs rates that is necessary for admittance to the World Trade Organization. "Montenegro wants to keep low customs rates, while Serbia needs protection of its producers because of the structure of its industry so it requests significantly higher taxes. Since agreement with the WTO can be signed only by the joint state, Serbia and Montenegro would either have to agree on joint customs rates or that decision would be made by the foreign arbiter," explained Medojevic. He said that process of stabilization and membership in EU could also cause similar problems. "Serbia would, naturally, insist to get higher quotas from EU for placing its agricultural products on EU market than those that would be offered to it, while lower quotas are more acceptable for Montenegro as a small producer. Serbia, as an important producer of these products and serious competitor at EU market would surely negotiate with EU, which is the reason why Montenegro would have to wait for its outcome," said Medojevic. He is of the opinion that these problems would happen with signing of agreements with International Monetary Fund, World Bank, European Investment Bank, European Bank for Reconstruction and Development. The first test, said Medojevic, would be fulfilment of requests towards Tribunal for war crimes in Hague that expects from Serbia extradition of several accused persons till March 31.