The value of giving a gift is not merely the price you could get from selling it. There is also value gained by the giver and recipient in the form of good will.
Gifting, while not normally seen as a capitalistic act, is definitely part of the voluntary market. Whenever two people exchange things of value, even a physical for a non-physical thing, it is part of the free market.
Don’t reduce liberty to its basic features, let it shine for all it is and can be.