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Dec 5, 2015 at 20:16 comment added user16989 Consider also having regional pricing. For one thing, zones usually correlate strongly with levels; it creates opportunities for arbitrage; it (arguably) is less arbitrary. Prices are certainly somewhat regional IRL!
Feb 1, 2013 at 16:29 history made wiki Post Made Community Wiki by Jonas Byström
Jan 12, 2013 at 20:45 history answered RalphChapin CC BY-SA 3.0