To be honest, not much. Combined pricing takes into account the individual pricing per word, then discounts the packages not vital to your needs. For example—a client would like copy editing with light line edits. Since the line editing is light, the individual price can be negotiated at 50% for the line editing process. Even though the copy editing price remains at the quoted price (0.0035 per word), the line edits will be 50% of 0.003.
This depends on your needs, however, my services are at a reasonable and affordable price. I am open to negotiations for pricing on any combination of editing. For larger editing projects, please contact me.