The answer to this is Theory (not hypothesis as some may say)
The Incas had a centrally planned economy, perhaps the most successful ever seen. Its success was in the efficient management of labor and the administration of resources they collected as tribute. Economic exchanges were made using the barter system by which people traded with each other for things they needed.
Answer:
<em>Pre-operational Stage</em>
Explanation:
The <em>pre-operative phase is the second phase in the cognitive development theory of Piaget.</em> This phase starts around 2 years of age when kids begin talking and lasts until about 7 years of age.
Children <em>start engaging in symbolic play during this phase and learn to control symbols. Piaget observed, however, that concrete logic is not yet understood.</em>
