The Economist has posted rebuttals to first-round arguments in my tax debate with French economist Thomas Piketty. Piketty seems to think that everyone with a high income has a “grabbing hand” that comes at someone else’s expense.

The debate over tax rates on the rich is important, but Piketty is important in himself because he is widely cited in the media and elsewhere as if he were a neutral authority. For example, President Obama’s budget featured a chart showing that the top 1 percent of earners have greatly increased their share of national income over the decades, using Piketty’s numbers.

But Alan Reynolds has found serious flaws in Piketty’s calculations. Piketty bases his calculations on tax return data, but reported income under the federal income tax has changed greatly over time.

The bottom line is to be suspicious when you see a chart on income trends that is sourced to this advocate of 80 percent tax rates.