This isnt abstract, modulo reasonable thresholds Gifts are taxed as income by value in most countries. Inheritance (in the US) _is_ the weird wealth transfer exception.
Just checked and in argentina there is no federal tax gift, and in some provinces it's just much lower. We also have a wealth tax so that may address the gen wealth issue in another manner.
Tax is like that different in every country and hard to compare apples to apples.
