How much money to spend on a gift?

Hi,

so far I have spent 15-20 Euro per person per gift and occasion, Christmas and birthday.

How much do you spend in America? Analog $20 for a birthday gift or a Christmas present, for example?

I like to give away nice things that aren't completely pointless. What are Americans into? What are typical gifts that are often given to friends, so that I get an idea of what is given away.

Currently, I am already collecting first ideas for birthdays to Christmas. I would like to give away a book. Watership Down. Is a book an appropriate gift or is such a thing rarely given in America?

Many greetings from Germany

How much money to spend on a gift?
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