How many pieces must a mailer send to claim Presorted First-Class mail prices?

To qualify for Presorted First-Class mail prices, mailers must send a minimum of 500 pieces. This requirement is in place as it allows the United States Postal Service to streamline processing and delivery, making it more efficient for mass mailings. By achieving this volume, mailers can take advantage of discounted rates that are lower than standard First-Class mail due to the reduced handling required for large batches. This pricing strategy encourages businesses and organizations to engage in larger mail campaigns, which benefits both the mailers through cost savings and the postal service through increased volume and efficiency. The other choices indicate lower piece counts, none of which meet the threshold for presorting, and therefore do not qualify for this pricing tier.