From the lecture: (with a little bit of editing)
Stratification is based on economic inequalities and shaped by status and power differentials. Stratification provides some people with advantages over others. Karl Marx explained you can either own property, or work for others and that capitalism makes class conflict inevitable.In time, oppression and misery should drive the working majority to overthrow capitalism.
Why did Marx's Revolution not occur?
People have more stake in the system
There is a higher standard of living
The working class are organized with unions
Workers have legal protection
Legal protection to workers