The publisher balance is determined by the sum of all titles' balances.
This amount is either owed to Itasca (if fees are greater than sales) or owed to you, the publisher (if sales are greater than fees).
This "prior month balance" is shown on the next month’s statement. If it was paid (by Itasca to you or vice versa), it is balanced out (i.e. a previous balance of $80 is followed by -$80 paid to the publisher).
If the amount was not paid, it is carried forward into the next month’s statement. (For example, Itasca pays the publisher only when the amount owed is greater than $50.00.)