at $60 many high-cost producers will shut down over time and new exploration and drilling will stall. saudi's market share will go up and saudi will make more revenues overall. yes $90 is the budget break-even point for Saudi. however that is a static view keeping output level constant.
i feel the saudi is determined to teach high cost producers a lesson. they will not stop until there is a chill down the spine and blood everywhere. they are willing to burn their petrodollar reserve in the short term to deter new producers for a while.
russia provides just the right excuse and O8 is looking away.
just my 2c