There's one big question mark hanging over OPEC heading into 2018

The Saudi oil minister, Khalid al-Falih, has worked hard over the past year to get the majority of the world's biggest producers to combat a global supply glut by honoring agreed-upon output cuts. 
Now, some are beginning to wonder what will happen with compliance when al-Falih finishes his one-year term as the president of the Organization of the Petroleum Exporting Countries (OPEC).
"One question mark hanging over OPEC for 2018 will be what will happen when al-Falih hands off th