Rising costs for gas and carbon taxes could change that picture.

That way the refinery can still use the whole barrel, so costs do not change much.

But that automatically means it's not just another party, and so the costs inevitably change.

If one child wanted to move into his own apartment costing $450 a month, the costs for the rest of the family do not change.

But no one seems sure how other costs, like health care, would change.

Also, the cost of their servers doesn't change even if the used games market didn't exist so your point holds very little weight.

To see how total costs will change, consider these elements one by one.

The cost can change depending on the tools, materials and how much work is needed to be done for each customer.

This cost had not changed substantially when they repeated the study in 2009.

And so the cost of health care in Cold Spring will change soon.