MacroVoices #532 Mike Green: Record Mechanical Flows

Mike Green, Chief Strategist at Simplify Asset Management, argues that the S&P 500 reaching new all-time highs near 5744 despite the Hormuz crisis is not surprising because market pricing is driven by passive investment machinery rather than macro fundamentals. Unless the energy shock meaningfully impacts employment and 401k contributions, the marginal pricing behavior of the index has no mechanical reason to change. Green presented a chart showing the largest one-month inflow into US equity markets ever recorded, attributing both the record inflow and the coinciding record one-month equity performance entirely to mechanical flows. SPY, VOO, and IVV discretionary purchases were among the smallest contributors, while CTA trend-followers covering massive net short positions built during the flat-to-down 2025 period and vol control strategies responding to realized volatility never reaching implied levels drove the bulk of the move. Systematic strategies have now returned to fully invested positions, meaning the mechanical ammunition that powered the rally is exhausted, and Green's near-term bias is bullish but muted for the next couple of months.

Target date funds are identified as the most important initial source of mechanical rebalancing, using threshold levels to shift out of bonds and into equities during drawdowns. Green attributes the simultaneous equity rally and bond selloff seen during the February 27 to early April drawdown to this large-scale mechanical rebalancing rather than any structural end-of-bonds narrative. As passive investing gains market share, the market increasingly behaves like a low-float stock because Vanguard and BlackRock will not change positioning unless they receive a sell order. The qualified default investment alternative functions as a government-sponsored mechanism directing US retirement assets into the largest public companies at any price. Passive investing also destroys price discovery, and the same passive bid is now tightening high-yield credit spreads even as signs of credit deterioration appear in the broader economy, creating a bifurcation in high-yield similar to the Magnificent 7 versus the other 493 companies in equities.

On the Hormuz crisis, approximately 13 million barrels per day of non-Iranian Gulf crude are currently shut in, representing roughly 13 percent of global supply. Of the roughly 20 million barrels per day that normally flowed from the region, only about five to seven million barrels per day are currently reaching markets, yet Brent was trading near 100 dollars partly because visible demand-side uncertainty is masking the scale of the supply shock. Green distinguishes three forms of demand destruction: price-elastic consumer behavior changes, income-elastic macroeconomic collapse, and physical supply chain shortfalls where barrels are simply not available in the right locations fast enough. He argues the third form is what is actually occurring and is being misread by markets as aggregate demand weakness. Acute shortages of jet fuel, diesel, and eventually gasoline are already locked in regardless of when the Strait reopens, illustrated by a tanker that loaded out of Iraq on February 22 and only unloaded in Los Angeles the prior week. Green estimated that even under a June 1 base case resolution, the global system will have lost roughly 1.4 billion barrels of oil, enough to drive prices materially higher, and if Hormuz remains closed through end of June he sees no way to avoid all-time high oil prices. While prompt prices have been sideways to lower, December 2026, 2027, and 2028 Brent futures were at or near crisis-level highs, and Green expects the entire forward curve to rerate higher as inventories continue to draw down.

Green disagrees with predictions of persistent secular inflation, distinguishing the current situation from the 1970s on two grounds: the US is no longer the marginal buyer of globally traded oil, and US labor force growth over the last five years reached only about 1 percent annually versus roughly 3.5 percent in the 1970s. Emerging markets are the incremental marginal oil consumer this time and are already experiencing near-catastrophic conditions related to fertilizer and agriculture. China is the world's largest importer of Gulf oil and the party with the most practical influence over Iranian behavior. Chinese crude imports have fallen by roughly three to four million barrels per day over the past two months, though Green cautions that falling imports do not equal demand destruction if China is simultaneously drawing down existing stocks. Beijing has publicly messaged toward resolution but has not announced SPR releases because doing so would reduce pressure on Trump to reopen the Strait, and China sees geopolitical opportunity in the situation. Green identifies as a key risk that Trump may settle for a quick deal that extracts far less than was achievable.

On the US economy, the BLS birth-death model has been continuously overestimating new business job creation by approximately 100,000 jobs, and when that overcount is removed the jobs data shows no improvement. The US labor force is now shrinking from its peak at a rate roughly comparable to the worst recessions of the past 50 years. Green describes a low-hire, low-fire environment where hiring rates for workers aged 55 and up are up 84 percent year over year while hiring rates for workers aged 29 and under are down 25 percent year over year. Weak hiring of younger workers reduces marginal demand because new job holders are the ones who move out of parents' homes, rent apartments, and drive purchases of appliances and construction.