Robert MacCulloch: How did the wealthiest 300 Kiwi families each make $50 million in 2021 when our economy busted?

The Inland Revenue Department's "High Wealth Individuals Research Report" states that "The Project population’s annual economic income varied over the Project period from $1 billion in 2017 to $14.6 billion 2021". Hold on. It was 2017 when Labour came to power and between that year and March 2021 the economic income of the wealthiest 300 families rose 15 times. Most remarkably, each family made $50 million, on average, over a period of time during which Stats NZ says "Average annual GDP declined 2.3 percent". I doubt there is any other five year period in our history in which that has ever happened.