Global Macroeconomics: Fed Rates & Yields

Start with the yield. A bond is a loan to a government. The yield is the interest that loan pays, expressed as a percentage each year. The US 10-year yield is the interest the US government pays to borrow for ten years. Because that loan is considered very safe, its yield acts as a world benchmark for the price of money. The US Federal Reserve (the Fed) sets the short-term US rate, and it meets about eight times a year to review it.

Now think of a fixed deposit. If your bank offers 4% and a safer place offers 7%, you may move some money. Large foreign funds think the same way. When safe US yields rise, some funds may sell shares in emerging markets like India to buy US bonds. Foreign institutional investors (FIIs) selling Indian shares can weigh on Nifty and on the rupee. When US yields fall, the flow can reverse.

The path is long: global cue, foreign money flow, Nifty, India VIX, option premium. India VIX is a fear gauge built from option prices. When traders feel unsure they pay more for protection, so VIX and option premiums rise. When the fear fades, premiums fall. This is why a headline from Washington can appear as a change in your option premium hours later.

The other side matters just as much. India also moves on its own news: the RBI policy (the Monetary Policy Committee, or MPC), the Union Budget, company results, the monsoon and domestic mutual fund buying. On many days these domestic forces cancel out a global cue. A rise in US yields has not always meant a fall in Nifty.

Rho is the option Greek that measures how much an option price changes when the risk-free interest rate moves by 1 percentage point. Think of buying a flat. You can pay the full price now, or pay a small token advance and keep the rest of your money in a bank deposit that earns interest. A call option works like the token advance. The saved money earns interest, so a higher interest rate makes calls slightly more valuable and puts slightly cheaper.

Futures show the same idea more clearly. A futures contract on Nifty is priced as the spot price plus the cost of carrying it until expiry, that is, the interest you would earn or pay, less any dividends. This carry is why futures usually trade a little above spot. Illustration: Nifty spot 24,500, interest rate 6.5% a year, 30 days to expiry, ignoring dividends. Carry = 24,500 x 6.5% x 30 / 365 = about 131 points. So a fair futures price is about 24,631.

For a short-dated weekly option the rho effect is very small compared with the effects of price, time and volatility, so most weekly traders can ignore it. For options that run many months, it matters more. Also, real futures prices include expected dividends and market demand, so the neat formula above is a guide, not a promise.

Before the result of an exam, nobody knows the marks, so people buy extra insurance. Option prices behave the same way. Before a Fed decision, an RBI policy, or an inflation report, traders do not know how the market will react. They pay more for options, which raises implied volatility (IV). IV is the market's guess of how big the moves will be, built into the option price.

After the news, the guess is replaced by fact. The uncertainty disappears and IV usually falls quickly, even if the index does not move much. This drop is called an IV crush (or volatility crush). A buyer who bought only for the event can lose money on a correct view because the premium fell faster than the index moved.

Sellers see the opposite picture. They collect the inflated premium and hope the event passes quietly. If the news is a big surprise, the market can move far and fast, and a seller with no protection can lose many times the premium collected. Neither side is naturally right: buyers pay for a rare jump, sellers are paid to carry that risk.

You do not need to predict the Fed or the RBI. A calendar simply tells you when the market is likely to be nervous. On those days option prices are richer, spreads can widen, and moves can be sudden. You can use that knowledge to reduce risk rather than to add it.

For example, you may decide to trade smaller on event days, avoid selling naked options into a big announcement, or simply sit out. Sitting out is a valid decision. A trader who never trades event days is not missing a rule; the market will offer other days.

Check dates from official sources: the Fed and the RBI publish their meeting calendars, and the exchanges publish expiry dates. Do not rely on memory for any date, because schedules change.