Gas Price

Why does the gas price change while it is in the gas station's underground tank?

I see those gas trucks pull up weekly at my nearby gas station to fill the ground. During that week I notice the gas price rising and rising. so my real question is if the gas is already in the ground and bought at a certain price by the gas station, why does it still rise? should'nt it only change on the next gas truck delivery when it is bought by at a different price? These are some questions I have been wanting answers for, for a real long time!

Gas stations exist to make a profit. They are not selling the gas at cost plus a margin, they are selling at the highest price that the market will bear in order to make the biggest profit possible. If they charge too much, then people won't buy from them and the price will have to come down. If all stations charge too much, then people will drive less and thus buy less gas. So, there is a perfect point where they make the most profit possible but don't drive away business. This is the price that you are charged.

Here's an example: You buy a house for $200K. You live in it for a year. After the year, prices of houses have gone up in your neighborhood and your house is worth $300K. You are going to sell it for $300K right, not $200K. It is the same house you bought for $200K, but now the market will let you sell it for $300K. Understand?

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