> The existence of this grey economy makes it very difficult to measure income and expenses for a large proportion of New Yorkers.

Disgusting that your first thought is about how difficult it is to measure income and not the fact that working class people (your words) would lose a third of their income or more, if their work was in the formal economy.

It's even worse if you look at it the other way: working class people's wages would be 50% more, rather than 33% less.

Working class people (literally anyone who must work to have a modest lifestyle) should not be paying a larger percent of their wages than those who do not have to work.