Curt Arens MAKING DECISIONS: Grain marketing may not be an exact science, but there are principles involved in developing a marketing plan that allow producers to make the best decisions possible. Tough Decisions: Develop a plan that allows you to make the best choice possible. Matt Stockton | Apr 06, 2021 Last year was difficult for those who are accustomed to making preharvest sales of the year’s corn crop. From 1979 to 2019, October’s average December futures prices were lower than February’s average December futures prices 70% of the time. This is what many would call a normal seasonal pattern for prices, but this was not the case for the 2020 season. Instead, the typical March through July seasonal high was replaced by a later-fall seasonal high. Those familiar with commodity markets call this an inverted market.