It is the sole swing producer with significant capacity to increase output, and therefore it controls the world price. (discovermagazine.com)
With global oil markets currently heavily oversupplied and US shale looking likely to take the position of swing producer in the short term, does the US or world really need more oil? (carbontracker.org)
OPEC took over as the supply regulator in the early 1970s but succeeded only when Saudi Arabia was willing to play swing producer, bearing the brunt of supply cuts or increases to balance the market. (cnbc.com)