"This metric counts the number of unique users who made at least one sale during the calendar month. For the analyzed period January - February, if a user makes a sale on January 1 and a second sale on January 15, Eulerian will count +1 for this metric. If the user makes a third sale on February 2, Eulerian will count +2 for this metric. As this is a calendar month metric, the counters reset to zero at the start of each month. To properly read this metric, we recommend analyzing it over a full month and avoiding aggregating it over several months to avoid counting the same buyer multiple times."