Sweden abolished inheritance taxes because the cost of enforcing the tax was greater than the taxes raised, and was passed by a left-wing coalition. At the time, it was considered a success of social democracy to not need inheritance taxes (and in fact, everyone, including the law, referred to dödsskatten - the death tax). 20 years isn’t ready enough time for wealth to consolidate like that via inheritance alone, and similar countries (like Norway and Germany) are seeing similarly rapid raises in their Gini Indexes for wealth, without chances to their inheritance tax systems. Something is broken in Western economies, but unfortunately, inheritance taxes in Sweden aren’t the problem.