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Mike Dolan: If the war in Iran ends, the ROI-Trapdoor will creak for dollars.

The U.S. Dollar has fallen to its pre-conflict levels due to renewed optimism about a possible ending to the Iran War. If it weren't for the U.S.-focussed artificial-intelligence boom, the greenback might be a clear casualty of ?any peace deal.

The dollar exchange rate was one of few prices that rose on the onset of war, aside from the oil price itself. This happened primarily 'by default. Other major economies in Europe and Asia were considered more vulnerable to the energy crisis than America, which is oil-rich.

At the margins, Gulf States and other countries seeking dollar liquid assets also played a role. The move was mostly a relative performance play.

The gains were modest. In the first month of the war, the DXY Index against the currencies most traded rose by as much as 3 percent.

It has now given it all back.

The dollar's strength has been eroded by a tentative de-escalation, and a fragile ceasefire. The greenback's strength has been weakened by a hesitant de-escalation and a shaky ceasefire.

The question of whether a trapdoor will open under the dollar if war ends and Strait?of Hormuz reopens has become a key issue for the global markets.

In order to figure out what's going on, there are three main concerns.

First, how quickly a normalization of oil prices would bring back Federal Reserve easing to the interest rate futures stripe while eliminating summer tightening biases in Europe and Asia.

The relative rate shift is arguably cancelled out by the fact that the oil and war spikes have taken two Fed rate cuts from the horizon for this year.

The twin threats of energy and rates have cast a dark shadow on European growth. However, the euro would be better off if they were removed together.

It's a question as to how quickly inflation and expectations can be reduced to return central banks to their pre-war levels.

Kevin Warsh, Donald Trump's nominee to the Fed Chair, may bring back U.S. ease-up talk as he takes over the hot seat. The U.S. stock exchange, economy, and labor market are not conducive to rate cuts. Warsh is likely to face stiff opposition from regional Fed bosses.

The hawks in Europe have been winning the battle of the last few weeks, but the economies are still weaker and will be arguing against rate increases if the oil prices already start to fall.

Sell Dollars in May?

Second, the Beijing summit between Trump's and China's president Xi Jinping in this month - postponed due to the war – and whether or not it will revive pressure for a stronger?yuan and ease another friction point on a list of trade disputes that is already fraught. The dollar reached its lowest level in over three years against the offshore currency renminbi as the latest attempt to reach a peace agreement in Iran played out on Wednesday. The dollar has fallen over 2% this year against the yuan, compared to a DXY loss of only 0.2%.

If Trump's presumption of a bias towards a weaker currency is to have any effect, it seems that the yuan channel will be the best vehicle.

The third factor is often overlooked by the bears of the dollar: the Wall Street recovery, which has been fueled by the sharply improved U.S. profits forecasts, as well as the soaring AI investment spending.

If capital flows are as important to the dollar's performance as interest rate gaps or trade, then switching back to U.S. stocks can be a powerful boost.

The profit-growth predictions for S&P500 companies for 2026 are now as high as 23%, up from 15% at the start of the war.

The Euro Zone Stoxx equivalents also rose, but only by three percentage points. This leaves 2026 profit growth estimates 10 points behind S&P 500.

The forward price/earnings ratios of U.S. stock prices remain higher than those in Europe or historical averages. However, a new price surge and momentum can cover this as they have done for many years.

A dollar trapdoor may well exist. It appears that the drop below it is shallower than first thought.

The opinions expressed are those of Mike Dolan a columnist at. This column is great! Open Interest (ROI) is your new essential source of global financial commentary. Follow ROI on LinkedIn and X. Listen to the Morning Bid podcast daily on Apple, Spotify or the app. Subscribe to the Morning Bid podcast and hear journalists discussing the latest news in finance and markets seven days a weeks.

(source: Reuters)