Iran War Cuts IMF Forecast While Banks, Prediction Markets Rise

**TL;DR**: The IMF cut its 2026 global growth outlook to 3.1% as the Iran war and Hormuz shutdown weigh on trade, while Wall Street banks and prediction markets post sharp profit jumps. Morgan Stanley’s Q1 profit rose 29% to $5.57 billion and Polymarket could earn $342 million in fees this year if trends hold.

The war between Iran and a US‑Israeli coalition has disrupted oil flows through the Strait of Hormuz, prompting the IMF to lower its 2026 global growth forecast from 3.3% to 3.1%. The shutdown has stranded crude, gas, chemicals and fertiliser exports, raising commodity prices worldwide. Despite the broader slowdown, certain sectors are benefiting from heightened volatility and increased spending.

Morgan Stanley reported first‑quarter 2026 profit of $5.57 billion, a 29% increase over the same period last year, driven by higher trading volumes and deal‑making activity. The bank cited robust client engagement as the main factor behind the rise.

Goldman Sachs and JPMorgan Chase also posted double‑digit profit gains, showing a broad uplift across major Wall Street firms amid market turbulence.

Prediction market Polymarket is on track to generate $342 million in fees for 2026 if its current daily fee run‑rate continues, up from $21 million earned since April 1 after a fee‑structure change on March 30.

The IMF’s downgrade signals that the war’s economic drag is spreading beyond the Gulf, affecting global trade and investment sentiment. Lower growth expectations could pressure policymakers to stimulate demand or adjust fiscal plans.

For banks, rising volatility translates into more commissions and trading revenue, though analysts warn that prolonged uncertainty may eventually curb risk appetite and reduce volumes.

Polymarket’s fee surge reflects growing retail interest in betting on geopolitical outcomes, a trend that regulators are monitoring for potential insider‑trading risks.

Watch for any IMF revisions to the 2026 forecast and for regulatory responses to the rapid growth of prediction‑market platforms.