Should you display the total price next to the cart icon?

In an online store, where the cart icon with a number of products in the cart is located in the header, is it a good idea to display the total price of the items in the cart next to it or not?

Can showing that information affect the user's mind and make them think about the price more?
Or would they get frustrated to not be constantly reminded of how much is the value of their cart?
Is there any psychological principles that prove this?