How much control does the government exert over businesses in a command economy, and what are some of the associated risks and disadvantages?

The government has total control in a command economy, all production, investment, prices and incomes are determined by the government. A command economy is also known as a communist society because business owners do not have any control over their businesses. In a command economy, there are risks/disadvantages of running operations this way because there is a lack of competition and efficiency. When the government controls everything, there is less competition because pricing is set by the government. There is also less efficiency due to them waiting on the government to make their decisions.