Classify the following events as mostly systematic or mostly unsystematic. Is the distinction clear in every case?
Short-term interest rates increase unexpectedly.
The interest rate a company pays on its short-term debt borrowing is increased by
Oil prices unexpectedly decline.
An oil tanker ruptures, creating a large oil spill.
A manufacturer loses a multimillion-dollar product liability suit.
A Supreme Court decision substantially broadens producer liability for injuries suffered by product users.