Sally sells sea shells by the sea shore.
She is the only sea shell seller by the sea shore.
She has the sea shell market cornered.
Every morning, Sally and her contracted prison laborers go to the shore and collect up all of the sea shells.
If you try to go to the beach and collect your own, Sally will ask you nicely for your shell.
If you refuse, she might offer to buy it from you for a quarter.
But if you insist on keeping the sea shell, her goons will throw you into the sea and you’ll drown.