Oes globalisation of world fianancial markets make international deversification of portfolios more or less desirable?

Topics is Does globalisation of world fianancial markets make international deversification of portfolios more or less desirable?”
This is a Master level Corporate Finance essay, dont make it wrong if you dont have exprience or background in this area then dont take it.
Topic is given abve, plz write anything must surrounding the topic and finance field. References are strickly needed and the more the detailed the better!!