In commerce, a level playing field is a concept about fairness, not that each player has an equal chance to succeed, but that they all play by the same set of rules.
In a game played on a playing field, such as rugby, one team would have an unfair advantage if the field had a slope. Since some real-life playing fields do in fact have slopes, it is customary for teams to swap ends of the playing field at half time. A metaphorical playing field is said to be level if no external interference affects the ability of the players to compete fairly.
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The Daily Omnivore 