Remember the see-saw: when yields rise, bond prices fall — so anyone holding these bonds took a loss today. Long-dated bonds like the 30-year have high 'duration,' meaning their prices move the most for a given change in yield, which is why the long end sells off hardest when inflation and supply fears grow. Traders demand a higher yield to lend for 30 years when they fear inflation (which erodes fixed coupons) and a flood of new government issuance (more supply pushes prices down, yields up).

The yield curve just plots yields from short to long maturities. When the long end rises faster than the front end, the curve 'steepens.' Beginners can read this as the market worrying about long-run risks — inflation, deficits and bond supply — rather than about near-term rate hikes. The short end is anchored by where traders expect the Fed's policy rate to sit, while the long end reflects those bigger, slower-moving fears.

A credit spread is the extra yield investors demand to hold a company's bond over a 'risk-free' Treasury — wider spreads signal fear of defaults, tighter spreads signal calm. Today the pain came from rising government yields (a rates problem), not from investors fleeing corporate credit, so spreads stayed tight. For beginners, that's the market saying 'we're worried about inflation and supply, not about companies failing to pay.' If spreads had blown wider, it would flag a bigger risk-off, credit-stress story.

Treasury yields set the floor for mortgage, car-loan and corporate borrowing rates, so when they rise, real-world credit gets more expensive — that's the 'squeeze.' Beginners should note the feedback loop: big deficits mean the government must sell more bonds; more supply pushes prices down and yields up; higher yields then raise the government's own interest bill. Traders watch this because heavy issuance is a structural headwind for bond prices.

Normally a war scare sends investors rushing into safe-haven government bonds, pushing yields down. This time the twist is oil: higher energy prices threaten to raise inflation, and inflation is a bond's worst enemy because it eats the value of fixed coupon payments. So instead of buying bonds for safety, traders sold them on the inflation threat — which is why yields rose rather than fell despite the geopolitical fear.

Gilts are UK government bonds and they rarely trade in isolation — global bond markets move together, so when US Treasuries and German Bunds sell off, gilt prices tend to fall and their yields rise too. The same mechanics apply: higher oil threatens inflation, and inflation erodes the fixed coupons on long-dated gilts, so investors demand higher yields. Beginners can think of it as the UK importing part of the global yield move even on a quiet domestic news day.

Higher oil feeds into petrol, transport and energy bills, which lifts headline inflation — and inflation is what long-term bond investors fear most because it eats the real value of their fixed interest payments. When inflation expectations climb, traders sell longer-dated gilts and demand higher yields as compensation; it also makes markets less confident the Bank of England can cut rates quickly, which keeps front-end yields firm. That combination is why an oil shock abroad can lift UK borrowing costs at home.