If Oil price remains at 50$ per barrel for six months. Euro will rise to 1.4 within 6 months.
50$ per barrel will make most of the asian countries trade deficiet to new highs and will be around 20% to actual GDP. JAPAN will be around 7% of GDP. JAPAN , CHINA will start withdrawing their deposits held in USD.
To buy oil , Country have to get dollars so they will devaluate their currency. While US still struggling to bring down its trade deficit only countries left will be either EURO countries or middle east itself.
EURO countries will force OPEC to accept EURO as alternate currency for petro. US also will agree to prevent syncronous fall of global economy.
GOLD also will shoot to 500$ if oil stays at 50$ per barrel.