It is an owner's right to get tax benefits for chattel, and there are businesses that specialize in appraising personal property, or chattel.
From the en.wikipedia.org
Slavery existed among Native Americans before it was introduced by the Europeans, although it was unlike chattel slavery where slaves become the personal property of a master.
From the en.wikipedia.org
Personal property can often be secured with similar kind of device, variously called a chattel mortgage, trust receipt, or security interest.
From the en.wikipedia.org
The former serfs were no longer mere chattel, but became subjects of law and were granted certain personal freedoms, such as the right to marry without the lord's permission.
From the en.wikipedia.org
Chattel slavery, so named because people are treated as the personal property, chattels, of an owner and are bought and sold as commodities, is the original form of slavery.