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There is a number hanging over every portfolio in America this morning, and it is not a stock price. As of 8:30am CT, the yield on the 10-year Treasury note was holding above 5.3% after touching its highest level since 2002, with the 30-year bond around 5.66% (Reuters). For anyone keeping score at home, that is what two decades of history being rewritten looks like, one basis point at a time.

The pain did not start today. Benchmark Treasuries just logged their worst quarter since 1994, a three-decade record nobody in the bond market will be framing (Reuters). Stocks have moved in lockstep with yields for weeks, and the direction has been unmistakable: up.

What is pushing yields there? The short answer is worry; the long answer is two kinds of it. First, inflation. Stalling peace talks between the U.S. and Iran have kept crude prices elevated through a seven-month Middle East war, and Brent surged 42% in the July-September quarter, a cost that eventually shows up in everything from shipping to groceries (Reuters). Second, debt. Investors are demanding higher compensation to hold U.S. government paper as deficits and issuance climb, and it is not just an American story: developed markets in Europe and Japan are caught in the same grip of debt worries (Reuters). Even the Treasury Department’s efforts to calm the selloff by increasing long-term bond buybacks have not helped much (Reuters).

Fed President Neel Kashkari recently put it plainly, noting that “inflation remains too high and that pressures have broadened beyond the oil-price shock of the Iran war” (ZeroHedge). There was one small sigh of relief this week: softer-than-expected U.S. inflation data lowered the odds of a Fed rate hike later this month (Reuters). But with long-term yields still pinned near multi-decade highs, “the cost-of-capital concern has not really gone away,” as Saxo chief investment strategist Charu Chanana noted (Reuters).

Why should this matter to you, sitting with your coffee and your 401(k)? Because the 10-year yield is the economy’s master dial. When it climbs past 5.3%, it pushes up the rates on new mortgages, car loans, credit cards, and business borrowing, and it raises the bar every stock has to clear to look attractive. It is the reason your savings account finally pays something real, and the reason borrowing anything feels like a negotiation with gravity.

What to watch next: today’s economic data, jobless claims at 8:30am ET and the ISM manufacturing index at 10:00am ET, could give yields a reason to move in either direction. If the data comes in hot, 5.3% might be a rest stop rather than a ceiling. If it comes in soft, bonds could finally catch a bid. Either way, the bond market has the steering wheel this morning, and stocks are just along for the ride.