More of both goods are able to be produced. This means a decrease in production. Less of both goods are able to be produced. Changing the assumptions for one good while leaving the other constant causes shifts, but only for one good. The side of the PPF that relates to that good will shift, but the other will stay the same.
Transactions are costless.
Assumptions of Command Economy Resources are directed and production is coordinated based on a plan Ownership of resources is public or communal Plan determines what will be produced, how it will be produced, and how they will be allocated Flaws of Command Economy Resources are used inefficiently No private ownership of resources. Less incentive to employ to resources at their highest value. Plans are usually the preference of the planner not the people. Each individual has less choice.