What is the result for the producer when scare resources are being used efficiently?

What is the purpose of the system of checks and balances

When and why did the united states enter world war 2

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.