What is referred to by 'a stocking bag'?

Based on the clue 'a stock certificate is an example of this also a w...', what is the answer? What is referred to by 'a stock index'? Based on the clue 'a stock market crash during his presidency vacuume...', what is the answer? Based on the clue 'a stock thats a low risk investment is a blue this', what is the answer? Based on the clue 'a stone marker on a grave or an old west arizona t...', what is the answer? Based on the clue 'a stone obelisk dedicated to president william mck...', what is the answer? Based on the clue 'a stone that is threatened with capture is said to...', what is the answer? Based on the clue 'a stop bath is one of the steps in doing this', what is the answer?