[sceptic123]

Given that this is about "global consumption spending" my take is that the richest people are finding new ways to hide their expenditure.

Doesn't help when the source data is not available to better understand what the claims made here are actually based on.

[sceptic123]

> … the main household survey used to estimate consumption in the UK has a low sample size, and there appears to be a growing problem of undercoverage of expenditure … the fact that undercoverage has grown over time means that it is not clear whether the relatively modest recorded changes in consumption inequality since 1991 are genuine, or just due to an increased inability to pick up the expenditure of high-spending households.

From: https://academic.oup.com/ooec/article/3/Supplement_1/i103/74...