Traders may use a combination of fundamental analysis, technical, and historical factors in their analysis. Speculators hope to profit from the relative changes in price between the initial and offsetting positions. Contracts may be spread against different months or different markets. Traders are concerned with whether the changes in the difference between the sides of the spread are moving in their favor or not. Position traders may hold trades longer and with less risk using spreads.
Lower good faith margin deposits required by commodity exchanges to trade spreads means more opportunities to average up and diversify positions. Spreads may behave smoother than the underlying futures contracts.