Economic Activity in a Changing World questions

Not essays, just some questions. They don’t have to have the longest answers possible just something to justify each one.
When did the service-based economy begin?
What do economic indicators measure?
What is the difference between a budget surplus and a budget deficit?
What is the stage that follows a recession or depression?
What is the difference between a recession and a depression?
Why may innovation play an important role in the recovery stage of the business cycle?