History seen from ownership relationship of production method
1 Joint ownership
2state where joint ownership and private ownership are blended together
3 Private ownership
4 state where joint ownership and private ownership are blended together
5 Joint ownership at higher stages
By recognizing this way it will be possible to grasp path of history of all peoples with big grasp.
Era in which we live is era of ③, description after ④ is prospect for future society.