An interest rate is a price for money. Change that price and the effects travel through almost every asset market.
The transmission is not always immediate or tidy. That is why markets can begin moving months before a central bank actually changes its policy rate.
Markets price the future
Investors do not wait for an official rate decision and then begin thinking. They continuously update expectations about inflation, growth and monetary policy. Bond yields, currencies and equity valuations can therefore move as the expected path of rates changes.
This connects directly to a principle we explored in Markets Do Not React to News. They React to Surprise. The important variable is often the difference between what investors expected and what new information implies.
Higher rates change the value of future cash flows
An asset is worth something today partly because of the cash its owner expects to receive in the future. When the return available on relatively safer assets rises, investors generally require more compensation for holding riskier ones.
That can place pressure on the valuations of companies whose expected profits sit far into the future. It can also make bonds, cash and other income producing assets comparatively more attractive.
Rates also move through the real economy
Borrowing costs affect households deciding whether to finance a home, companies considering new investment and governments refinancing debt. Higher financing costs can reduce demand, slow investment and eventually affect corporate earnings.
The effect differs by company. A highly indebted business refinancing frequently may feel higher rates quickly. A cash rich company with long dated fixed rate debt may be far less exposed.
Currencies add another layer
Interest rate differences can influence where global capital wants to sit, although currency markets respond to many variables at once. A country offering higher yields may attract capital, but not if investors believe inflation, fiscal risk or political uncertainty overwhelms the return.
Do not reduce markets to one variable
Rates matter enormously, but they do not explain everything. Earnings, liquidity, positioning, regulation, geopolitics and investor psychology can all change the outcome.
The more useful habit is to think in transmission channels. Ask what changed, which cash flows or discount rates it affects, which assets are most exposed and how much of that information was already priced in.
