Primacy effect

Recency effect & Serial position effect That items near the end of a sequence are the easiest to recall, followed by the items at the beginning of a sequence; items in the middle are the least likely to be remembered.

If you have three pricing options, then you are most likely to sell the middle option most often. If, however, you have more than three options, then your last and first options should be the hottest sellers. Price and plan accordingly.