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