Why are some toner cartridges described as Chip Included

Headings for some toners have Chip Included in the description. Why?

Price. - You see several listings, same toner cartridge, different prices. Do they include the Chip?  Some companies will offer you a lower price without the chip, and when compared with the competition it would seem a better value. its Not

Read descriptions carefully. One with Chip included is better value in my opinion