In Macbeth, we see quite a few examples of the effects of power. First, we see that ultimate power – or even the possibility of obtaining it – can amplify the traits of the person in this position of power. In this case, the trait that is amplified is Corruption. Second, as the level of corruption goes up, the characters seem to make less rational decisions. Finally, if the person’s power is threatened, they make increasingly bolder moves to protect their decision.
In the play, we see how either obtaining power or having power causes the persons bad traits to be amplified. For example, when Macbeth informs his wife that the witches have told him he will one day be the King of Scotland, she immediately starts planning how to kill Duncan, when he comes to their castle. This gives us a very distinct impression of Lady Macbeth, and it shows us that she is morally corrupt. Through various insults to her husband, she eventually convinces him to assist her in her plan to kill Duncan. While this shows that Macbeth is also not completely perfect, morally, it does show us that he is more loyal to Duncan.
Another example of power amplifying a person’s characteristics is seen when Macbeth hallucinates – both before killing Duncan, and after he sends out for Banquo to be killed. We see here that he still has second thoughts about what he is doing – and therefore is not fully corrupt. Unfortunately, the feelings are not yet strong enough to have an effect on his actions.