Yes, this situation can be divided into several types: cross-time arbitrage, cross-commodity arbitrage and cross-market arbitrage. What you are talking about is intertemporal arbitrage, but the spread of contracts in different months has become a spread. Usually, the spread needs to expand to a certain extent before arbitrage, or when the spread is zero, you can expect it to expand or arbitrage. However, forward market and reverse market are involved here, so a combination is an arbitrage model of four models. It will be relatively complicated, and you need to master the spread and market changes to judge arbitrage opportunities. I am a speculator who often arbitrage, because arbitrage is relatively stable, but the profit is low. Once there is an arbitrage opportunity, the money earned is small but almost stable.