There are four basic forms of social stratification, they are as follows: Slavery: Slavery is an extreme form of inequality in which some human beings are regarded as property items, belonging to another individual or social group. Slaves had no civil or property right; even the marriage of two slaves was not considered legally binding. The legal conditions of slave ownership have varied from society to society, and from time to time, but a slave could always be bought and sold. Thus, it has taken different forms, depending in part on the particular economic use to which slaves have been put. In ancient Greek, slaves were recognized as forms of investment which are acquired through conquest and trade to only well-to-do citizens. For example, slaves were the chief source of labour in small factories goods were produced from shoes to armour by the rich Athenians. In Rome, where the ruling groups had a low opinion of trade and commerce, slaves sometimes became wealthy through their b...