Refining costs, distribution costs, and taxes, none of which varies significantly with oil prices, constitute a large portion
Why this is right
Refining, distribution, and tax costs are significant portions of gasoline's price and don't vary with oil prices. Thus, even if the oil cost is halved, gasoline prices won't fall proportionally, as these other factors remain constant. This seriously weakens the analysts' prediction of a direct price drop by half. Let's say a gallon of gas costs $4 to the gas company, $1 - oil $1 - refining $1 - distribution $1 - taxes $4 total expenses So they sell the gas for $5 / gallon (in Los Angeles), so that they can profit $1. If the cost of oil gets cut in half, then now their expenses look like this: $0.50 - oil $1 - refining $1 - distribution $1 - taxes $3.50 total expenses The prediction was that the price of gas would fall by half, so now gas in LA would cost $2.50 / gallon? That doesn't make sense. The gas company would be losing money at that price point.
Skill tested: Weaken · how this choice captures the argument's function is the move to repeat next time.