Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How much would it cost me to buy one gold futures contract on Comex?
In order to understand how much you might gain or lose from participating in the futures markets, it is important to first understand the different ways in which the slope of the futures markets can be described. In many of the futures markets there is a possibility of somebody buying a commodity at the spot price and selling a futures contract on it. In order to do this they need to hold the commodity in storage. Most commodities cost money to hold in storage, so the futures price will tend to be above the spot price for these commodities.  In the case of stock index futures, the holder receives a potential benefit from holding the stocks in an index.   If the futures market is upward sloping compared to the spot price, then it can be called normal. If the futures market is usually downward sloping compared to the spot price then it can be called inverted. If the futures market is high enough above the spot price so that more of the commodity gets stored for the future, then the market can be called in contango. If the futures market is below the point where the commodity can be profitably stored for the future, and the market can be called in backwardation. In many of these cases, there is an implicit cost that the buyer of a future pays in order to hold the contract for certainly time. Your question is how much money you make if the price of gold goes up by a specific amount, or how much money you lose if the price of gold goes down by the same specific amount.  The problem is, you do not say whether it is the spot price or the futures price which goes up or down.  In most cases it is assumed that the change in the futures price will be similar to the change in the spot price of gold.  If the spot price of gold goes up by a small amount, then the futures price of gold will go up by a small amount as well.  If the futures price of gold goes up by a small amount, this will also drive the spot price of gold up.  Even for these small price changes, the expected futures price change in expected spot price change will not be exactly the same.  For larger price changes, there will be more of a difference between the expected spot price change in expected future price change.   If the price eventually goes up, then the cost of holding the contract will be subtracted from any future gains.  If the price eventually goes down, then this holding cost should be added to the losses.  If you bought the contract when it was above the spot price, the price will slowly drift toward the spot price, causing you this holding cost.  If the price of gold does not change any from the current spot price, then all you are left with is this holding cost.