What system of stratification is commonly used in capitalist societies? social caste social class slavery wage slavery gender?

 "social class".

Stratification means the method with which in a society various groups of people are ranked. The rank of individuals is often decided by how the society is stratified. It can base on monetary status and income which is the most general base of stratification.

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.

answer; ///he could not explain why the continents drifted;