Power In Macbeth
I think that the more power someone desires, the more corrupt actions they'll commit to obtain that power. I also think that Shakespeare would agree with this idea to a large extent because Macbeth exemplifies this exact behavior. In the beginning of the play, Macbeth was portrayed as a loyal warrior who would do anything for his king. However, when Macbeth met with the three witches who prophesied that he would be king, there was a change in his character, which with the help of persuasion from Lady Macbeth lead to the death of King Duncan. Unfortunately, it didn't stop here; since the first part of the witches' prophecy came true, Macbeth set out to kill his friend Banquo and son, Fleance in order to prevent the second part from coming true (Banquo's children become will reign). Shakespeare shows that power corrupts by using Macbeth who's craving for power results in the killing of others, and eventually his downfall.
Power In Monopoly
I don't recall too many instances where I had power over a whole country, but I do remember having power playing monopoly. When I was younger, my favorite board game was monopoly, and whenever I played with my friends, we appointed an "accountant" that passed out and collected the money whenever someone bought a house. We all knew that this was a big role that shouldn't be taken advantage of. However, back in those days, I was a corrupt official. Whenever I was the accountant, I would steal some money from the bank and put it in my stash so that I could buy all the houses and win the game (....but does anyone really ever even win a game of monopoly?) Just like Macbeth in his campaign for power, I performed corrupt deeds in order to win, and these actions were stemmed from my abuse of the sacred power of monopoly accountant.