Classify the following events as mostly systematic or unsystematic. Is the distinction clear in every case? a. Short-term interest rate increases unexpectedly. b. The interest rate a company payson 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 multimillion-dollar product liability suit. f. A Supreme Court decision substantially broadens producer liability for injuries suffered by product users