Well, because it is an invasion of privacy and it is rude to the other person.
Answer:
sorry,
I think yr question is incomplete.
At the beginning of Act I, Nora seems pretty easy-going and nonchalant - even a little bit superficial. She seems to love her husband, even though he shows a patronizing attitude toward her and scolds her for spending too much money and resembling her father.
However, she already has some small acts of rebellion - such as eating macaroons in spite of the promise she gave Torvald. Her cheerfulness also seems a little bit strained. We can see that she is a dependent woman who is expected to play by certain rules. We can also anticipate that their marriage is not perfect, even though they act happy.
Advertising. This is something that impacted people in many ways. Think about it, when you walk down the isle to look at cereal. Which box looks more appealing? Most people would say the name brand box with a character or picture on it.
