Europe came under the rule of one emperor when Charlemagne was crowned.
The correct answer is atomic bombs.
Whilst Liberalism is founded on ideas of freedom, equality and liberty. Social Democracy is the best balance of freedom and equality because it promotes social justice in a capitalist economy and a liberal democratic view. Also, communism has, historically, a poor reputation for freedom and equality. For example, China and North Korea are current communist countries and Russia previously was a communist country after the Bolshevik Revolution in 1917.
Answer:
Traditional economy relies on habit, custom, or ritual to decide what to produce, how to produce it, and to whom to distribute it.
A market economy, economic decisions are made by individuals and are based on exchange, or trade.
A command economies, because a central authority is in command of the economy.
Mixed economies market-based economic systems in which government plays a limited role.