Does Russia have the largest underground economy?

[Swampy]

A report says Russia has the largest underground economy. That status of being the biggest or smallest can't be proven or disproven, for obvious reasons.

[Sir John]

In about 1985, our Bank's Chief Economist wrote a piece on world economies and stated that as a general rule of thumb, 10% of an economy is "black" (cash).

I expect that to vastly increase over the next few years.

SJ