An ETF that trades against Goldman's advice would be an interesting product.

You might appreciate the second section of http://www.bloombergview.com/articles/2016-01-20/bank-gloom-...

Okay, so let's say that China is gutted, with a real estate bubble that makes 2008 look rosy by comparison, massively low consumption, a nonsense stock market propped up by 1 trillion USD, and thus China's due for a globally relevant collapse.

If I have let say 100k in capital, is there any instrument through which I can short China's real economy?

Perhaps Bitcoin

This sort of advice is always junk. If the trade tips were good investments, they'd capitalize on the info themselves rather than giving it away.

> they'd capitalize on the info themselves

You don't know that they aren't. If ciients act on these ideas then they'll help move the market in Goldman's favour.

Based on their past behavior they often do. But they make sure they disinvest before their advice changes...