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					Originally Posted by Yakk
					
				 So, you have 100,000 gallons of gas in your underground tank.  You bought it last week for 3$/gallon.
 Next week, you can buy gas for 4$/gallon.
 
 Someone comes by, and offers to buy 100 gallons of gas from you at 3.25$/gallon.  Do you sell him gas?
 
 1> You sell him gas.  You earn 325$, and place it in a bank account that earns 6%/year.  Next week, you have to buy 100 more gallons of gas.  You earn 36 c in interest, and pay 400$ more for gas next week.
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 I'm not sure I follow...
Once you cut into the gas reserve you bought at $4/gallon, don't you just raise the price of gas sold at your station to compensate? Then you can sell the 100 gallons you bought at $4/gallon for $4.25/gallon and still earn the same profit-wise, right?