As Opec-Russia meet in Vienna this week, here are some possible outcomes

OPEC and its allies gather in Vienna this week to discuss production cuts after the biggest monthly drop in oil prices in a decade.

They have the broad outlines of a deal after Russia and Saudi Arabia agreed over the weekend to extend their cooperation into 2019, but details are lacking. Whether the group bring about the end of the oil rout will depend on the size of any cut, how clearly it’s communicated and whether members follow through on what they’ve promised.

Here are some possible outcomes:

A Big Cut

The Organization of Petroleum Exporting Countries has already told us how much they’d