I don't understand what it means 'to take advantage of someone else' in the context of this thread.
Is Starbucks taking advantage of me when I want a coffee by selling me a coffee?
Is Elton John taking advantage of my desire to see him play live at my party and the fact that there is only one of him by charging me a million dollars to appear?
Are the bus companies taking advantage of my need to get to work when they sell me a ticket?
I don't get where normal economic transactions and supply and demand becoming 'taking advantage' or 'exploitation'.