the link between social class and social mobility is social class ia an open system which means people are able to move up and down the social hierarchy resulting in acheiving social mobility but...
socio-economic class (a group of people having the same social, economic, or educational status)
The French class referred to as the "bourgeoisie", or merchant class.
British Labour Party
There were Thralls who were the slaves than the ordinary people and then the warriors,kings,etc.