Why are girls more expensive than boys?

Answer 1

This may sound cliche, but maybe clothes are actually a reason here. Boys tend to buy/need less, and what they need is less expensive than girl clothing. Of course this can't be applied to every boy and girl; there are definitely girls who don't buy many clothes and there are surely also boys who do (although to be honest I don't know any).

On the other hand of course boys (girls too of course) can get expensive through gadgets like computers, mobiles or video game consoles.

I think in the end it's really not possible to say in general that girls or boys are more expensive, but it depends on the individual.