What are the reasons for the disntegration of communal economic system

The Communal economic system is defined as the cooperation and sharing of production, distribution, and consumption of goods and services involved.

Reasons for the disintegration of communal economic system are as following:

Free market economy - it depends on exchange society which includes family partership and are not able to survive in urban-life.Social cohesion - They make a  difference between communal economy and market economy as it supports the competition of statutes of an exchange society.Government - poor decision of government can affect production decisions and can disintegrate communal economic system.

Hence, about factor affect the communal economic system.

The answer is b. the rock layers were originally submerged in a shallow river environment. something happened along in time where the river setting was turned into a ocean setting. this was probably caused by erosion. i hope this : )