Why are developmental psychologists forced to rely so heavily on correlational data instead of using only controlled laboratory experiments to test their hypotheses?

An economic system where all or most businesses are owned by government

Match the following items. 1. free enterprise system 2. mixed economy 3. the former soviet union 4. land and capital (a) private and state ownership of business (b) factors of production (c) private ownership of capital (d) command economy

Why did separate government develop in ancient greece?