There are 100 (2 from each state)
Yes, this is correct.
Crucially, this is only the case if everything else stays equal: so if the quality of the product stays the same and if the income of the buyers doesn't decrease.
Then with a lower prize, more items will be purchased - and less if the prize increases.
The answer is the German tribe called the Visigoths.
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.
