Goldman Sachs forecasts that increased oil supplies from Iran and rising inventories could lead to lower oil prices by 2026, with Brent and WTI averaging $56 and $52 per barrel, respectively. A potential US-Iran nuclear deal may boost Iranian output to 3.6 million barrels per day, impacting global supply dynamics. Despite slightly raised demand growth forecasts, a slowdown in global GDP or OPEC reversing cuts could see Brent prices plummet to $40 a barrel by late 2026, prompting volatility in oil markets and necessitating a reevaluation of energy strategies worldwide.