What is the difference between a beneficial and an adverse supply shock?Macroeconomics

A supply shock is a sudden change in supply that causes
the equilibrium price and quantity of a good or service to change.  An adverse supply
shock is one that causes supply to go down.  This is something like an oil embargo.  If
all of a sudden the US economy can get much less oil, the supply of pretty much
everything will fall and prices will rise.

By contrast, a
beneficial supply shock causes supply to go up.  This would be what would happen if a
new invention caused the price of producing a product to go down suddenly.  This would
increase supply and the sale price of the good would decrease.