<span>In Roman times, the divisions between the groups were investigating for the Empire because it resulted in a high amount of infighting and conflict. Because of this, they were unable to stand united again external threats and forces. This instability resulted in the fall of the Roman Empire.</span>
North Korea, Cuba and communist society have a key feature, a command economy. Moving to a mixed economy would involve less government market control. United States and United Kingdom are examples of Mixed economies.