World economic policies? If I understand your question correctly, you are asking for the legal status of Bitcoin across the world? Well, there is no such a thing, each country has its own regulations. Typically:
- China has banned exchanges, but not possession or peer to peer trading.
- South Corea has set strict rules for exchanges.
- The US is very strict with ICOS and they have charged against some clear scams. You can´t invest if you are not an accredited investor. Bitcoin is fine.
- Singapore is benevolent as is Switzerland.
- Some european countries don´t have taxes on the sales of bitcoin such as Germany or the Netherlands.

So...there is not really a global policy.