I disagree, I don't think it will affect the ''world'' it will effect some companies and have a small effect on the economy of the world. There is no financial benefit for the UK to leave the EU.
The thing that will happen is that british people will lose buying power (-10% already) they won't feel the effect for the 1st few months but after a while they will. This might cuse Hyperinflation (Price of stuff skyrocketing ), or that the currency becomes dog ***.
The UK imports most of there Basic needs (Food), and exports secondary needs.
Now if they are going to change the trading there the Brits might have a bigger problem then just listening to the EU