Title: Economy of Greece.
Question: How many Greek shipping companies were in operation in 2011?

Title: Ottoman Empire.
Question: Persecution of Jews in Spain occurred after what event concluded?

Title: London.
Question: What is the daily cost for most drivers to operate their cars within a given zone in the center of London?

Title: Separation of powers under the United States Constitution.
Question:
What is the term for judicial institutions exercising their power?