Here is a interesting basic explanation of what a lot of us are talking about on here all the time. Its a pretty good explanation with graphics.
Part 1: http://tinyurl.com/c3kk69
Part 2: http://tinyurl.com/cdg5xo
Part 3: http://tinyurl.com/d42rss
1 way to avoid letting your shares be used this way is by setting a sell order way higher then the current price without an expiration. This makes it so the institution can use your shares.
Part 1: http://tinyurl.com/c3kk69
Part 2: http://tinyurl.com/cdg5xo
Part 3: http://tinyurl.com/d42rss
1 way to avoid letting your shares be used this way is by setting a sell order way higher then the current price without an expiration. This makes it so the institution can use your shares.