Report from Global Financial integrity. Author is Jeremy Haken. I havent had a chance to read it yet, but here’s how it summarizes itself:
“This report analyzes the scale, flow, profit distribution, and impact of 12 different types of illicit trade: drugs, humans, wildlife, counterfeit goods and currency, human organs, small arms, diamonds and colored gemstones, oil, timber, fish, art and cultural property, and gold.”

Must be worth a quick peruse. Thanks, Monty for sending the link.